diff --git a/day06/day06.lisp b/day06/day06.lisp
new file mode 100644
index 0000000..e597398
--- /dev/null
+++ b/day06/day06.lisp
@@ -0,0 +1,11 @@
+(defun parse-input (input)
+  (uiop:read-file-string input))
+
+(defun part-one (input)
+  (loop :for (a b c d) :on (coerce (parse-input input) 'list)
+	:for i :from 4
+	:if (and (not (member a (list b c d)))
+		 (not (member b (list a c d)))
+		 (not (member c (list a b d)))
+		 (not (member d (list a b c))))
+	  :return i))
diff --git a/day06/input b/day06/input
new file mode 100644
index 0000000..627d62f
--- /dev/null
+++ b/day06/input
@@ -0,0 +1 @@
+llqnqffqsqttfffbcfcbcbdcczccfssvwswrwddzlddpdhdwwlvlffjllnjjwjqwjjttwbwcwfccdmmnddgvvpwvvgsshnshsgglljfjzjpjfpfjpplddjcchdhvhlhvllvflfbllsdllgppwjjprjpjrrdwrdrggjvjppgbgttdppwhhcshsvvgpvggsllstsggdjdmjjrvjjszjsjbbsffjwjnwwzjjjvqvfftbffbpffndfdzfdfvdfdggmpmbbwgbgnnbtnnnhggdmdffrqrlrhrzzrmzzmbzzcdcwwzffsrrnfnvfnnvppwjjndjnndtdppgcppsmppljlpjjmlldlsltlglwgwcwnwvwddzrrllwjjnvjvwvppjssncnfcnfcfcczfccpjphjphjjjsgszzhthghjhrjrbrtrjrhrsrfftfzftfmmwmpmgghbggjrrsdswddtjjvnnrwrzrpzzlglwggrnrgrfftnffwwgllrqqzbqbbtltbbgdgpgphggspggplggmcmscsffzcfzzbggdrgrqgrrnlrnrbnnzsnnzcctvvnvwvnwnhhwpwtptllpflfcfttwtjjhwjhhbwhbbtppwhwvhvghvhphpwwcgwwhbbfvbffzpzlllrzlrrbnnrngrnrpnnsszbbqffpsffhfshfhzzqhhcgcgfggzmmdllthhrhnrrwggdqdsstccqllflmflfddjwjzjffvjjfgjgdgbdgdngnpgpnpffsnsjnnbbjdbjbtbmmbrrlbbqmqpqrprjjrbbvnbbzvvcwwlfwfggmhhdhsdhsdhshhqfhfrhhqlqttffpmmjzjqjggqzzdfzflfsllshhvjvfvbfvbbjljhhzrzqqszqzsqqswswbsbzszgzdgzzhjzhhvffhthvtthltthghzhvvjttczttlssvvgjjmsjstjjrfjjhbjbnjbjddqrddnbdnbnwbnbqbmqqgtgqtttcmmqbqrrgrrsrszssvpsvvjqjttjpjwwmwfwttczttgccwhcwwrzwzbwwqbqmqnmqqnfnmmmzdmzmpmssdpsslbbmgmbmlmnlldlccvzzlrzzqbqfqlflwlvlhhtrtcttgnnqhnqqtjjphjhwjhwhpwwvdvfddmndncnppcffhllfvfdfllhgslvtsqhtlfdflcjfmqbnctnfnwqrlqbzrcbvldrffcptsgslqcszqcfdvtpggvdqblwcgmdjqrpjdhtrmvrfrzznspqlfhnjsppbpjdggcwjwprpnlnntgfgmflctqphdmzfvpzzmbzmvrqdgchzmdvjdzmfsslpqvhpgznmpspjpdmlfwwjbbwqbfthghclldpmnsbcwlzswrsnfzbdzpcnrrpspdpfqhvmtfjlppqtphvzzqrwhzccnrgrtgfbfgtwvlwsmcvzmqmhsvztmmvpjzfwzgfwntbrsfthdgrcmgtdsvzcllmcshrlqldrvrnmdgbwttmhczvscrdvfgdvrhfvlghhsfbmrptbwmpnvtsrjlpjlbmmjzwwzbdtjlqqdczqgpzfjslccrcrblhplndblghchczbjjfzlsvvrqhvgdsncgpjhjlprhfhswwbmrnszqzhhlrbqpphvgtfsgmdpjwgcmqnvfdhrqmbspjpdrtdbqnbmbpgqwgmltqwrjprvsfjsmpldcqqbvmfhgzltzfvhlnfdqrphzzjrbdvnnjspvnlnnsdzvgqsqztndjpmnbqtwnpzmmfhsswwnnwwlbnpgbrhzchbnsrwwpprhntngsjzvssttqwfvjrdddtfpgtqqzcwljzmdjtgzdqjjvbqgdttdgvqvlfdsgcjhsmdmwrwdcqdflpfjbfzsvjrzrhhcnvcjblwcdvtbgfhfgcwrcjsrzcdrfwtvdqrghdtrjgdmhrfcsnwwwdpvjtpzdqfgrlmrqscjbfgdbgvflhvdjmnmslvsbcbgwplgqljmlzpgrfjwmvqfwmwrhnmdjhdwgjrngvccrbzmhcqthvvtdtmfqvfczhqbfgzgrmdtprznfzjtrcwqgztchtdmzmnwbfbnbttbvzsflcpsjshgphfdlvhdrcpsqnhjjggbnsqrfpwsdznzcwjbcswwndzbpdnfcbdrfgrmqzvtjttltbntznmqfsmqlgqvlqnrvgrnggslqhbplmgpzwlfzbvwdvrchsnhrnvgmzjdprvvspltcdzmdnlgtmrwnwpdndpdqjltcnmsggrvbprslqhfgmzqtppdpsjcmmbvfgmbpdnwdcgnssfgjhzhrjljdwhrzznscndgbscdmbbtbrnzbqzvcjgjgljbjlrrvdhjdllsnjzhwlmjslghrqplwjwssbzzpdzdfhhsqctlcddnfnnvbcwpdvzdcsgcqpctsjtdtnzpggpzsrrhfjtthqcqhtvwzltbdvdnbgwlppblwzjsqqbcpcrthhrhdnzhdnflqlvbzmcjfcrbmgdgqptfqfbmlfbblqdfmnwgvbdhmcmtmvtggqstjpwhvzjhbgpblmdrnggvrvphbglqgfcphmrgfmrwcdchtwfllqwsnbqttwdcvrwgzjfztmcffppqtmnwpgcrgwtjbdtjlmnpmvlzndljglzblwdrggqvbbfvqcbcbpqttrmqlcqnqvrfqsnlpmwlcgfwfcqpgmszfccbqtcqfwlwqrjjhrdbjqvdmfzjgncjqgqbthpgjgbfdvltbhpnbjqqwrsczrthfhmlzjjjgsjtsvgmwfsjngzfqdqzfhvwjrswvnqvsvvsjdbwlwdcsszdngmmhnnqsgvsrvpnndghrwgzztqczvhcrzdpqtrmrnfsfrlpdnbbtshfhplzqvdvzdvwhwsbpnbzlvcbgptdszjlcgfdzchjcsvhzdljvgpwstzwnssvhztcptnhslggnrschvfnmhcnjvldthtfpqzdvltfgnmtgvlrljhwqdzqfmfblstvfnpfcdsqslrqbztrbfzmsfjtjwhlzfnhrvpfqfqvtdllrvchmqphgljwcspgpwsdwqfdhsqhsflpbcbjjmjrfjrqrqfqcqzqsqcnqhfgsclfnfzblfdhphrvqdpvcqmllrcdnrlwqbrgqsbfqqllcvmglntjwcsjljgntmmldscndfdjcqpwbqpbmfjsgwfwcqbqbbhhgprlbzmvdfjcsmsqvhfhmgrhnwpslztmwbhdgrfzfcmwjswpbpzwstfbfmgwtprmptzjwtrqthrqwgslnmtlfgnvgpwvsfwthtrgwfbnnnwmdcfrpqqztplscvfnfpfwwdnfnzjccnhswwlcrrdqfhvsrnvcdrwmjswzggscplggbwgndsbntqvtrjbmbzrnbbmdjvwrmmtrmfjjhnvrcjcbqlhlthbvtjjczddblbbttmmzgdqmtdqswjdwbjhsrjbvdtqzqdbhhgbttgmgwfgfpczpqpfsddgslltwsvngwbwfbfcdzlqghwdbfzzldjpwpmpjmslwnwbrjjvwcsjgdzjwrrwnvgvrqlgjhwvrgnczspfplhfbtdpbpfqmhbvmcqdgrrjfslzgsqfpwrrrmjdtgbslddwvddrbmrdsdhhnlwsncrmnglrrpvtbrfvjbdmcpgphcdfwnfcglvmlbslttpmjnspqhnmbcqgmncfjjpdfjqhggnswbgppjhllscrvtmtmmbwbpgddtzblscntrmccdpzdnllqpvfdpfpwwvnnbjlzphvqwffwsjmbtllctrjmllwscmldcdrpfrzrqlpwbjwfgmnshzqzgdjqhcwtsqlsjffvzcpnrzmvtlzlgwvrrjtdbcnddbhjgqqzrvhplrbsrwgscjnfmhbcnpdcjqrltgdzzzzbqtsspbcdssbjrzfqdgvhmgdzsjdsqcfwbgrnhrlzgpjmhctqdccmvqzddmcptsjgtfshprqmslvtmtrprfsngrnnpnrccrvnrvcwzrbbnbghlwvcncgzglnqthchhsnzlfrcggdptvwlrbnfwgjpflgrcfzhhgffwcbhwlsdmvmsvvzvdcrlvlnstgz