15 lines
231 B
Python
15 lines
231 B
Python
noHear = set()
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noSeer = set()
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N, M = map(int, input().split())
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for i in range(N):
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noHear.add(input())
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for i in range(M):
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noSeer.add(input())
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new = noHear & noSeer
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print(len(new))
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for name in sorted(new):
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print(name)
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