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#!/usr/bin/python3
import itertools
def main() -> None:
with open('input', 'r') as f:
xs = f.readlines()
print(next(
x for x in
itertools.starmap(common, itertools.combinations(xs, 2))
if x is not None
), end='')
def common(x: str, y: str) -> str | None:
it = (i for i, (a, b) in enumerate(zip(x, y)) if a != b)
i = next(it)
try:
next(it)
except StopIteration:
return x[:i] + x[i+1:]
if __name__ == '__main__':
main()
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