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n=int(input()) eng=set(map(int,input().split())) m=int(input()) french=set(map(int,input().split())) both=eng.intersection(french) numboth=list(both) print(len(numboth))
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Set .intersection() Operation
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n=int(input()) eng=set(map(int,input().split())) m=int(input()) french=set(map(int,input().split())) both=eng.intersection(french) numboth=list(both) print(len(numboth))