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s=int(input()) set1=set(map(int,input().split(" "))) a= int(input()) set2=set(map(int,input().split(" "))) print(len(set1- set2))
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Set .difference() Operation
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s=int(input()) set1=set(map(int,input().split(" "))) a= int(input()) set2=set(map(int,input().split(" "))) print(len(set1- set2))