15 lines
343 B
Python
15 lines
343 B
Python
import sys
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N, M = map(int,sys.stdin.readline().rstrip().split())
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setN = set()
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setM = set()
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for _ in range(N):
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setN.add(sys.stdin.readline().rstrip())
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for _ in range(M):
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setM.add(sys.stdin.readline().rstrip())
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result = list(setN&setM)
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result.sort()
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sys.stdout.write(str(len(result))+'\n')
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for s in result:
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sys.stdout.write(s+'\n')
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