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#!/usr/bin/env python3
from collections import Counter
def main() -> None:
with open("input", "r", encoding="utf-8") as f:
formula = f.readline().strip()
f.readline()
data: dict[str, str] = {}
for line in f.readlines():
x, y = line.strip().split(" -> ")
data[(x[0], x[1])] = y
pairs = Counter(zip(formula, formula[1:]))
for _ in range(LOOPS):
new: Counter[str] = Counter()
for pair in pairs:
new[(pair[0], data[pair])] += pairs[pair]
new[(data[pair], pair[1])] += pairs[pair]
pairs = new
# Ran out of memory, lol
# chars = Counter(flatten(map(lambda p: (p[0],) * pairs[p], pairs)))
chars: Counter[str] = Counter()
for pair in pairs:
chars[pair[0]] += pairs[pair]
chars[formula[-1]] += 1
print(chars.most_common()[0][1] - chars.most_common()[-1][1])
if __name__ == "__main__":
main()
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