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n=int(input()) english=set(map(int , input().split())) b=int(input()) french=set(map(int , input().split())) print(len(english.intersection(french)))
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Set .intersection() Operation
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n=int(input()) english=set(map(int , input().split())) b=int(input()) french=set(map(int , input().split())) print(len(english.intersection(french)))