백준 1764번 듣보잡

#백준 1764번 듣보잡
N,M = map(int,input().split())
nolisten = []
nosee = []

for _ in range(N):
    a = input()
    nolisten.append(a)
for _ in range(M):
    a = input()
    nosee.append(a)

no = set(nolisten).intersection(set(nosee))
no = sorted(no)

print(len(no))
for i in no:
    print(i)

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