diff --git a/06/input b/06/input
new file mode 100644
index 0000000..66a449a
--- /dev/null
+++ b/06/input
@@ -0,0 +1 @@
+mnlnvlljqqccznnjtjljbllrtllwwpmmhjjbbzppnndmmsppdqqwvvstvssgmsggmlmttnvvfbbdsssnzzbssjrsjjpmpvmmcjjwsssndsslwsswtwnwrrslshhvzzsppffmpfmmfvfpfpsssqpqzpqqcjcjnjcnnzbzjzpzbpbnbwbcctvvhgvgsvvpwwvjjvqjjjdqqrmrmqmsqszqsqpsqslsddhbhcbhbchcvvjvjcjnccdbcdcrddldblbffhvffpvpzpvvmvfmmwhwqhqvhqhmmpdmmlbmbgmbbrqqpmqqcvcmvvcncllptltvtdtbbqzzcggjgsjjvjsvvgmgffqhqqgpptspsffvdvbbhqhzzllvvjbvvbpppggfpgptgtvvzdvdzdgzgccmmphpmhppldlnlpnnhghhrrgwrwssnllmpllbvbvqvtvhtvvmnvvpgvgfvggtztpthhcfhfqfhhnhtnhhljhjppqjjffgjggrwrjjhphzhtztggwswnwzzvbzzmmtrtqtjqttwlwmmmmnddmnddwvvcllgrgfgzznwnsswjjhwwspsbbvzzqvzvbvcvmmtltnlnfnfnwwsvwwpswppjhjdhhmbbblfbfwffwvvjgghwhzhjzzrttwhwjhjchjhggdrgdgmmsjsfstftvtmtctggcwgcgzccgzgsgrgmmjhhqzzrmrttgtgfgcffvsfvvslsvvpqvvnjnrrwdwcwcnnhllwpwdpwdpdqqtwtftdftddppncpnccllqqrffpssgvsvtvmvssrbrhbbzggtssdsvddqfdfjfhjhdjhhncnddfpdfdmmrddncnvcnvccgvvhzvzwztwzwtzwtwqttrlrvrddztzrzcccgmmqgqjgqjgjqqspqqpjppbggchcqcpqqgbgdbbspbbrbhrhzhqhrqhhhtbhhvshspsvsggjdjwjwvjvdvwddjggmrrbnrrztthlllhlclbclbbhpbhphjhccdwccdbbjrbjjmrjrhhnlnjllltwltlmmlqlnqntqnntsnsqqvtvwvgwvwnncgcdctddnttfjfqfttrhrjhjqqcnnsmnmgmqgmgbblcctntrntnccnvvmpmjjvfjfrrbpbttsbttvnttmnnjdnndnzntnrnwrwcctllvhvqhhddmzztppphghphzzglzlnnfccrfffvvhllpspwssstwstsvttcrtccfssbccdjdqdfqddrbrqbbtllmmsfmfcmmzwzpznpnttjgtgbbdtdvdwwpmphpprsrjrbrqbqwwljlslrlrhhpchpcprcrtcrcfcfssndsspddcjjjfmfqfggmssnhsnhnpncnfnmffdrdjdhjjrgjrjgjqgjqqlmlljffbcfcrrrzwwftwtrrpgpprqqmrmhmwhwmmcrrhqrqwqppwjwggpdpgpvgvzvttqlljhhbvbhblhhcsssvmsmppcvpvrvzvbvtbtssplpgptgtnthhvwhvwwfvvfwwmtwmwfmfgmgnmnllgsgmsgswwhqhhhzqhhfwwnttmfmrrfnnpbpssvbsshqhqvhqqbmbpmbmqqjtjqjvjtjjhtttpzphpqqwqfqttqqhfhbfhfwwcpcpssdvvzhzwwqddjzdjdldlggvnvlnlbljlqjjmcczbccznnlnslswlwplpttvrvllfwflftllhclldhlhddbvvpvzpvpmmrccvgvdvqqjcqqwvvnjjlbbjwjrjhhlzhlhttljlcjjsnsgngrnntzzbsbmbsbrbdrdppjrjlrrjljqlqhqqnqsgdvhpgdhmnslqtjclmcfzrmgmlfnjbzznfgfprvwprwdbcgfcclmspgnzpbshwjbqvhzhrhswjzbfvnmcjtfvqbwmjpvfvctpmwsspdbtvfhfdfzjdpqnvslgmdvrnflzwzcnzmvzsvznwhpwtjwnqdgrrttmmdwzbbnwtllpbffrgtpjjjwltqrcbqcttdwnfjpmhdsbbpqmstjqchgjvfrmrbgqrlstnbdnzzzbzbsmsnnsssswmqhcbswtjhmcgnwmcclhzjqjzqcpbzgdzjgqzpqbmvvhtcznfrhdndswfvfhtfpdpszpjqrlwfdscvcngftwqmfttjtjrlbgcwvcjwsstqmcblmjzsgtgrqnqqvhzhvsphjmbcpfcznlcqldcvhlsvggbjngmhspwwqhlwstslvwmmbwqdmrgdvvnlstmjllhzscrhzjtmnsjfbndnlmzqbzgdgbcqchnbvwsftjtznnbsnvsgzpdzdqznjsslrlfnccdhwsljhczggvmgqswjltmrqqmwtbzmtdzhpjcvmwsscsdzpfnwlcrrdgzqqdmgwdlzvvvjcqsgpcwvrdnrstpcmgfjnjffbfmgzjthhllzrlsjtnqfppltbrlnqnjvqlvtpqvsbfgmmlcdzhgmzzqjwtqtzmpwwddbqrqnfzzpsjglsjddsslwwlrttzfzplmwsswlnvrvwwcgddjwcmvsjjbfgcfjmthfbpmcwjptchhnsmzttjqnwzdljffghhqdcwzwgbvfsmwqdbtblphdgcmbhprtbccjbzqrpvjdbnsmlwfntvjgptnshzmddwbhgwsnfrjbpqqwlsfdpnmmnnwhdmhzvjcmddbdnjzfzvffbgdqgwbggprcrbzwhvtzzgbhhcscrlmfgztfswjbsnwsmdfwlntwjzvlwhvlrfzszllmflmrsrcfnncvszvgdmmnvgrqnjhljcnrrhpdhffwmrsqfnbcpfdmmgppwjbjrwdfmpcrbznrjnbmssszhnlbpgmlczhhcdtgjqcbqrvzcbpgrftfhzdqthhspwnqqswntlpcmmqtcszngpggqvfjnmnprhdfjsngwrncjcmqdmjhpdlfnshpdlnlfpcnprwjgdvwwbvhvsbrfjtqsqjnvcpfdsrnfwmrrbtcvcqzflhdlbpcthzthdjzsrvwgbhjvhbtrngthfrszlvrbtnscsqlblcwlngslspcrhqzzdlzcdbhqdhthlpmdrntbhnqtwtzwpndbgphpsllbvgqjtmszdvjpgttzcmbwgrgdwmsbfgvgbbcmsnhvmnsbcsthsdwdqtghpdclfbglbdjgnnnwhmzzvnhbmgfbmvqwvwqhdswgtzslspmbmznnwdmjbzbddhzchtdzdzgwtlmlpmwrqvghpfwhvfjrtvmjwgjjnwdwnpdcqjdmcctjfcrdgpvczvnhlrbfmqgnrhmdwsrmmpqhvwgqgbqccpznpjfldwpntnvzgdfzljmtqwvfnrdsjsqgbvzjsczwwjggqtrpvwgqggwwhqggtgqfjmzsmjvdhdwqggbgnftpqqqlsfpflwrdpjwnhfdpchcgntjshgtwnwrnpsvwmplvqcltbgrcpflpgzbqfclghfnwjchnbgjnplgldmphdplvjrnrtzcmlftprsnmrjmnffpqjlvqlztbwprjwprrmmgzhjgdnhbfdrwjtvsvnbqhtfhbqgdrvcwlwfdbbcthgvttpvrwrqmpmrmvgpjzwlpvbqcvgccpgfddjbwhrvgqmjqzwgghllrtrblcpbttmcrgjsftlqhjfvqnbhmhbhngwnfqtgdttstzvmstrqcpfjrdgtsdbqqccqvbhpwhnpmpqgntfqszndjrmfhlqjqjbqvjtlfmrnnzzrtqlzzhjfqmmsmzvzrcplmfjpcmpfmpzbsbrmbnbnjqwjcfwnnwwrwzvvrsvhvrwnhlmwqjdztqthcwnwrlbjdflfsbplbwfmzqqnpwvzjbcfdgztpwttlrvhlfzzsfltpqwcpnzlsqgvwnqfvgclrfvssfcfmfvvjsndrhqdbrqfggfhjbvdvvmgpglqzwgjdmqtscjpfhgsbshghtmftrrhznttpzrzcsmrrvzdjmwtmbcbpqbsdmqzqdzrncwzmptltvdphsltfrhbbrdzbnbsqdhfvrgvmbgfvwblsjvfphlpzfvsllwnqjmbhngzzslcdmdzfgrgscbzggrzmbmwlzbnpzcvsbsfgdpnwzljsf
diff --git a/06/solution.c b/06/solution.c
new file mode 100644
index 0000000..69f76af
--- /dev/null
+++ b/06/solution.c
@@ -0,0 +1,34 @@
+#include <stdio.h>
+#include <string.h>
+
+int count(const char *l, size_t len, int num) {
+    int i, j, cc[26] = {0}, tc;
+
+    for (i = 0; i < len - num; i++) {
+        if (i > 0) {
+            cc[l[i-1] - 'a']--;
+            cc[l[i+num-1] - 'a']++;
+        } else
+            for (j = 0; j < num; j++)
+                cc[l[i+j] - 'a']++;
+
+        for (j = 0, tc = 0; j < 26; j++)
+            tc += cc[j] == 1;
+
+        if (tc == num)
+            return i + num;
+    }
+
+    return 0;
+}
+
+int main(void) {
+    char l[4096];
+    size_t len;
+
+    fgets(l, 4096, stdin);
+    len = strlen(l);
+
+    printf("Silver: %d\nGold: %d\n",
+           count(l, len, 4), count(l, len, 14));
+}