14 lines
273 B
Python
14 lines
273 B
Python
N = int(input())
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K = [input() for i in range(N)]
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shared = K[0]
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for k in K:
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for i, c in enumerate(k):
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if c == "?":
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pass
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elif shared[i] == c:
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pass
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else:
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shared = shared[:i] + "?" + shared[i + 1:]
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print(shared)
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