diff --git a/README.md b/README.md
index 4ffa16e..5eef36e 100644
--- a/README.md
+++ b/README.md
@@ -8,6 +8,7 @@ I use python 3.11 without any libraries beyond the standard.
 
 | Day | Time      | Rank  | Score | Time     | Rank  | Score |
 | --- | --------- | ----- | ----- | -------- | ----- | ----- |
+|  6  | 00:14:52  |  9153 |     0 | 00:17:06 |  8413 |     0 |
 |  5  | 01:01:27  | 11570 |     0 | 01:05:20 | 10701 |     0 |
 |  4  | 00:12:09  |  5789 |     0 | 00:16:03 |  5187 |     0 |
 |  3  | 00:47:15  | 13278 |     0 | 01:07:44 | 12947 |     0 |
diff --git a/advent/days/day06/__init__.py b/advent/days/day06/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/advent/days/day06/data/input.txt b/advent/days/day06/data/input.txt
new file mode 100644
index 0000000..0365fef
--- /dev/null
+++ b/advent/days/day06/data/input.txt
@@ -0,0 +1 @@
+jfnjjwbbqttplpvllqgllmdllfmllscssqmqzmmwzznqnwqnwnqnjjbdbpbtbdbzzzljljzjjpccrmmppzfpzfpfnfccfbbcqcrcffblfbftbfbtbwwwmgwmgmnngnllnfllhghcghhjppchcfcnfffllmmqbmmpwwwwlqwwqgqcqsqjqpqzqqdzdtztltslsljjfqfcqqgbqqqghqgqvgvrggqwggrgjgmmnrmmzgmzgzpzjjctcmtcmcnndppcvpvrrwvrvhrvhrhjhnjnvjnjrjggccvffnqqvfqvvnmvmqmfmfqqzfzbfzzzgpzpllrwwnpwpnwnwgwhhrrdnrrdjjzjszsjjbddcdbbvmbmqbqnbqbsqbsqqwbwhwggssdnnmttvnnvmnmhmfhhjchcttzdzdqqszzcwwhhwzhwhphqhcqqsggddfmmvzmzwmwfwzwrrbmrrnwnfnwnlwnwrwfwnnmtnnzwnwdnnbhhrphrhlhwllpmmbcbtbffmqffddjnjwwzpzfpptbbqqwbwzbzjbjmjljblbtlblqqhqbqggrngrgllbmbccmhmqmqwwqcqssqzzfjzjrjnnqrqssfnsnvvtgvvmsvsqqljjbsbrrjllvfvzfzmzhzzhthjhshlslfljfjqjpqpvvmpmhpmhmqqmmdwmddppjlplhlsstlssgnggrbblggffcdfdzzwqqtztqtwqtwtzzsjsbszsbsvbvwwjqjnnpdpccwssvdsdzzqbqbtbtqtmtltltvlvddzwzzfpzpjpgphprpgpqqwppdwpdplddvffcdffvpvqqgvqgvvrfvrvqrrcjcpjjpttftqqvjqvqsvqsvqssdpdbbbmcmscsddbhhgttwhhjlltqllnqntqtsscnntwwhswswlwggldltlttsjszsnznsznzccbtbblplnnmfmqmrrvjvhjhzhnzzgnnhrrdrllblpbllfdfjjssvnssvlsllnqqhwqhhhsgstsjstthrrhrghrhhfmhmwhwrwwsrwrfwwdnntqnnsvnvmnnfvnntztqzqhqnqjnnjfflbfllrsllqhqdqccgvgnvvcwcfccmssqnqhhqrrfrtrvvnjnpjnjjpplmlppvmpphjhppvhvdvssjcjrrtrdrrsvvbbjzzrtztgzghzhccwmccshhzbhhdwdwsdswwlcwllpblpphrppfhfnffrbbcgcmggnvnzzmvvcrrftrftrffcscvcsslbljlglzgzbzczszmsmbmnbbhdhvvsqvqhvvfrfddbpwgvztwwqcpzhhwnhphnrwldjmztsptbbgsqbqqccwbdqzvhfjlfldgphzbfprclgpfztbrgvsvfpghmdchscbdqjqgzvmrtdrfzbhgdvgznjcsmglcfwhdtpsljnvvzjcbbrczwtgpdmgpzhctvbbmvsjzthffsjqhfsdrclpqslbhnmpczwvggpzbjcchfjzjhhgtrmlgnzlndfvzrccgggrpmprbmjbfjjhzrhrtwgqdbgdlqghssrnmtmpvttcqwnwdzhgfnddgbqcsdvzvwqdnmmpwrwhfbqtcpqhvwbczrmjqzsntvdrncwjsmvvwcngrtlwtjmnctwrrtvphbjhlqmgzfsfsrblzzvmzlbhzjhwbdfpncdrfchmrqhspdszcjrnvwtmjzmsmzcdphsdzjgqswwrpdvlpvrdnhplnlmswvcrzlcmbtqtscjfwrnrctrvdqcqzwcvgvpdgrndrgsrvzftwpqjjgjhzwhvrjlqntdtcjdrqzhqlqqdffcgvttlhvwgggnwmdlvghfgjpsmntbvbjbbttrwsljwsrvtmznvqdptpwtdcwtcsfdjlmdqthqggjcptrqhbsbjzqqmvvjmgmppqmjmnjdqvspzlbgzjsjshpslmszqnzghsszpsmpzfcrqqjdwvtbnzstvvjzvtzgpptcmvmbvmpvpzvgfnwtlmdzhvhshtwvnbgwmtzqhcptflpqsqvmptchpfcbwhvjzdcnsnqrgdwfcthqfssnbqnvgvvhlzqfqmdlcwnshtvhhhpghjbmhdbfbqcvbnbvwbzcbbmjnrqmsdqnmnbsrvhggzsrlbwtfmgwrnlhrbrrrqdcspnrpnppngrtdqtbmbhcbjrlhpfjpdnfndmqvwvhlgmsntpwrlrwwqhwvzbpzqqggnbqlsjjqtbqjcdpmndgmtdhfbqrpdzzsnmhzmqqnbdqftqmnhfbdzdlfwgjsjhrcsmtfzgwbvbbzdrlbmcgmppqfppmbqrnsmrmhrdsvgcfmzpfnvrbbgfccfcbphszwdbnnwcjjvvlpdtfzgtslvgqwmsvlpzjcbqwqclrjrsgthhtqrqrhvsdfjntgllsvslrvdtnsdmrgtqcmswnqwlrwlfmcfftbjpvdnmczqzldsssszhjtqtqvqtwhjcqchjvqvntvzzzprbmjcctsqfdcvpbtsgnnsqtqnmjhrgqcjnzrdsgrbtdpqjbgcmnfwhnsrfwcdmncjzwcngfbmmrsbvgvvqpvrdjfsqwjdmqjdpzcbjjfmzjjgbnwqgrvpmbzdhsgtldrzvglscfwbmjltcrzrgdslgprwscwbrhtdtglznjdcvfjzjjqzntdqdbcrcbbmvnzdshjzcsfsgpghmgdqdwsnwjtvtbqbqccbcwjpnhdhzcvdssvnvqtvzwprhpgftdwwvgsbnlzzjppcrrwmrsthvjjrvrsdrbdqfgsjsmwfplpstrbnpdhhcblhjfwzngmhlwbvnfcbgwshspsbbgbldrvmcnczszpgnddrfwrtgcqjggrrcbjwrdjlrvtspbftrtjbzjwchpfnjctcjtwtpmtblczcftqlphdjczfrvtzlsglpvhqsqqblttdjrlczhrqsgpggmvnhpqtrfbpgvzftwtsmwhwswtpvtwnsshmlcffpcjshqhqqsjtpbgszscmcbnhjjtjmpgfdhgmljqmmwlfptstjjvqhcbjpjpwzwqflhslclzzjlmcttbsncqmfzhgnzwbdtnvfwbtztwbhtfsqjfzwmfflmbwnqzqhcjwdpbvngsgzlwvwcqhqjsndznbbdcqqhmjjpqjbsnvwztgmqwdcbbjvcndmhsbvbjnzlbscmgnjcrrwrfdljtcsgmwtffgcjflpzzdcnzvmrbnrjbbmhzqqjtgsrwqmmrhpndwlbnrtrhhpqlmdrcrtdmzsslrmffpftdjvfcpvvhzhjhqtrrsclvtbsccgmmqrjbqgbmpnbzlsncssdhmjppjptvddfgbbnjzjjldjlqjzhhttsclrmsgzctwjqqvtjlfzwgtffgrdjzwdcnrprlcswffghngrqcgsbzqhhvbfjtwcjlrrmbtqjdrgpnbftnmzqnndnqwgrqndlwmjnnspbhjlnzrnptnrmcjhpbfcqpvbchvdwthjlcrfpssgtfbsgfrftcrwttrspbsvzpvcczmdqslcdgfljvtjsdpjnwmdvfzfllrdrbgvpltzlqcrlwbncswhfvrdthspmhfhfdlvpbcqlmjfznhnqblffftgzqrtswnmtnvjprqqhhhvrscvbbzgmnlnprghfdjqbgjppjzjrnclfdssbmgspwcscnlcrrqmtlljrmcwgdgcqwvvjzvsjdjvsspszlcthwzrwqtzdgmqvnlvvzrvrpqqwswzcchncrpnjdmflvmhhwvrrstpvnszfrmvpdtpqpbdmwvvbbpjnwmtststtlcvqdnvqqphzlhhzbbbjssgdcnhlmwrzwvwmcmgrcngqzcnffqzfnvldpdjmsspgpbrzhnszfnljfcrgsjvqjjbstvghlcslhqlzhltpglwffrzfgjghssfgrptbnpbhqnhhfbjsnmsvltqpthdmzzrhrhhmzlplvrtdqfrfrppdpqnllblcfjqpdwznsbrhcncdpmztcrjrfnlwtznrmpbzqsbrqrbnthgfpshrdhnwjmrnsmsfqwdjsmsvhfrbdpjrwcvmdvvmdtfqjgmdsrqtctsdmznngbsrfjvhllgwt
diff --git a/advent/days/day06/data/test01.txt b/advent/days/day06/data/test01.txt
new file mode 100644
index 0000000..5a2b0a7
--- /dev/null
+++ b/advent/days/day06/data/test01.txt
@@ -0,0 +1 @@
+mjqjpqmgbljsphdztnvjfqwrcgsmlb
\ No newline at end of file
diff --git a/advent/days/day06/solution.py b/advent/days/day06/solution.py
new file mode 100644
index 0000000..33125c2
--- /dev/null
+++ b/advent/days/day06/solution.py
@@ -0,0 +1,30 @@
+from __future__ import annotations
+
+from itertools import product
+from typing import Iterator
+
+day_num = 6
+
+
+def part1(lines: Iterator[str]) -> int:
+    return marker(next(lines), 4)
+
+
+def part2(lines: Iterator[str]) -> int:
+    return marker(next(lines), 14)
+
+
+def marker(line: str, length: int) -> int:
+    """
+    Returns the position just after a marker. A marker has [length] non repeated characters.
+    Raises Exception if no marker was found
+    """
+    for pos in range(length, len(line)):
+        identical = 0
+        for a, b in product(line[pos - length:pos], repeat=2):
+            if a == b:
+                identical += 1
+        if identical == length:
+            return pos
+
+    raise Exception("No marker found")
diff --git a/advent/days/day06/test_solution.py b/advent/days/day06/test_solution.py
new file mode 100644
index 0000000..0e6c3f7
--- /dev/null
+++ b/advent/days/day06/test_solution.py
@@ -0,0 +1,31 @@
+from advent.common import utils
+
+from .solution import day_num, marker, part1, part2
+
+
+def test_part1():
+    data = utils.read_data(day_num, 'test01.txt')
+    expected = 7
+    result = part1(data)
+    assert result == expected
+
+
+def test_part2():
+    data = utils.read_data(day_num, 'test01.txt')
+    expected = 19
+    result = part2(data)
+    assert result == expected
+
+
+def test_marker04():
+    input = "mjqjpqmgbljsphdztnvjfqwrcgsmlb"
+    expected = 7
+    result = marker(input, 4)
+    assert result == expected
+
+
+def test_marker14():
+    input = "mjqjpqmgbljsphdztnvjfqwrcgsmlb"
+    expected = 19
+    result = marker(input, 14)
+    assert result == expected