/Python/Set .difference() Operation in python3

Set .difference() Operation in python3

# Enter your code here. Read input from STDIN. Print output to STDOUT
n1 = int(input())
set_1 = set(map(int,input().split()))
n2 = int(input())
set_2 = set(map(int,input().split()))
print(len(set_1-set_2))

Source: programs.programmingoneonone.com

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