diff --git a/14/14.py b/14/14.py
new file mode 100644
index 0000000..c44dd96
--- /dev/null
+++ b/14/14.py
@@ -0,0 +1,55 @@
+from collections import defaultdict
+import sys
+
+from pprint import pprint
+
+
+def part_x(template: str, pairs: list[tuple[str, str, str]], iterations=10) -> int:
+    duos = defaultdict(int)
+
+    for i in range(len(template) - 1):
+        duos[template[i : i + 2]] += 1
+
+    for i in range(iterations):
+        next_duos = defaultdict(int)
+
+        for duo, n in duos.items():
+            inserted = pairs[duo]
+            next_duos[duo[0] + inserted] += n
+            next_duos[inserted + duo[1]] += n
+
+        duos = next_duos
+
+    print(duos)
+    letter_counts = count_occurrences(duos, template)
+    return max(letter_counts.values()) - min(letter_counts.values())
+
+
+def count_occurrences(duos: dict[str, int], template: str):
+    letter_counts = defaultdict(int)
+
+    letter_counts[template[0]] = 1
+    letter_counts[template[-1]] = 1
+
+    for duo, count in duos.items():
+        letter_counts[duo[0]] += count
+        letter_counts[duo[1]] += count
+
+    letter_counts = dict(map(lambda kv: (kv[0], kv[1] // 2), letter_counts.items()))
+
+    return letter_counts
+
+
+if __name__ == "__main__":
+    template = sys.stdin.readline().strip()
+    sys.stdin.readline()
+
+    pairs = {}
+
+    for line in sys.stdin.readlines():
+        A = line[0:2]
+        C = line[6]
+        pairs[A] = C
+
+    print("Part One:", part_x(template, pairs))
+    print("Part Two:", part_x(template, pairs, 40))
diff --git a/14/ex14.in b/14/ex14.in
new file mode 100644
index 0000000..b5594dd
--- /dev/null
+++ b/14/ex14.in
@@ -0,0 +1,18 @@
+NNCB
+
+CH -> B
+HH -> N
+CB -> H
+NH -> C
+HB -> C
+HC -> B
+HN -> C
+NN -> C
+BH -> H
+NC -> B
+NB -> B
+BN -> B
+BB -> N
+BC -> B
+CC -> N
+CN -> C
diff --git a/14/input14.in b/14/input14.in
new file mode 100644
index 0000000..776112d
--- /dev/null
+++ b/14/input14.in
@@ -0,0 +1,102 @@
+ONSVVHNCFVBHKVPCHCPV
+
+VO -> C
+VV -> S
+HK -> H
+FC -> C
+VB -> V
+NO -> H
+BN -> B
+FP -> K
+CS -> C
+HC -> S
+FS -> K
+KH -> V
+CH -> H
+BP -> K
+OF -> K
+SS -> F
+SP -> C
+PN -> O
+CK -> K
+KS -> H
+HO -> K
+FV -> F
+SN -> P
+HN -> O
+KK -> H
+KP -> O
+CN -> N
+BO -> C
+CC -> H
+PB -> F
+PV -> K
+BV -> K
+PP -> H
+KB -> F
+NC -> F
+PC -> V
+FN -> N
+NH -> B
+CF -> V
+PO -> F
+KC -> S
+VP -> P
+HH -> N
+OB -> O
+KN -> O
+PS -> N
+SF -> V
+VK -> F
+CO -> N
+KF -> B
+VC -> C
+SH -> S
+HV -> V
+FK -> O
+NV -> N
+SC -> O
+BK -> F
+BB -> K
+HF -> K
+OC -> O
+KO -> V
+OS -> P
+FF -> O
+PH -> F
+FB -> O
+NN -> C
+NK -> C
+HP -> B
+PF -> H
+PK -> C
+NP -> O
+NS -> V
+CV -> O
+VH -> C
+OP -> N
+SO -> O
+SK -> H
+SV -> O
+NF -> H
+BS -> K
+BH -> O
+VN -> S
+HB -> O
+OH -> K
+CB -> B
+BC -> S
+OV -> F
+BF -> P
+OO -> F
+HS -> H
+ON -> P
+NB -> F
+CP -> S
+SB -> V
+VF -> C
+OK -> O
+FH -> H
+KV -> S
+FO -> C
+VS -> B
\ No newline at end of file