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n = int(input())
a = set(input().split())
e =int(input())
b = set(input().split())
r = a.difference(b)
print (len(r))
We need to perform the same technique like intersection() method
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Set .difference() Operation
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n = int(input()) a = set(input().split()) e =int(input()) b = set(input().split()) r = a.difference(b) print (len(r)) We need to perform the same technique like intersection() method