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a=int(input()) n=set(map(int,input().split())) b=int(input()) c=set(map(int,input().split())) r=n.intersection(c) print(len(r))
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Set .intersection() Operation
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a=int(input()) n=set(map(int,input().split())) b=int(input()) c=set(map(int,input().split())) r=n.intersection(c) print(len(r))