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n = int(input()) n1 = set(map(int,input().split())) b = int(input()) b1 = set(map(int,input().split())) both_subscribed = n1.intersection(b1) print(len(both_subscribed))
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Set .intersection() Operation
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n = int(input()) n1 = set(map(int,input().split())) b = int(input()) b1 = set(map(int,input().split())) both_subscribed = n1.intersection(b1) print(len(both_subscribed))