hackerrank-python/sets/set-difference.py at master · anishLearnsToCode/hackerrank-python · GitHub

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# https://www.hackerrank.com/challenges/py-set-difference-operation/problem

int(input())
english_subscriptions = set(map(int, input().split()))

int(input())
french_subscriptions = set(map(int, input().split()))

all_subscriptions = english_subscriptions.difference(french_subscriptions)
print(len(all_subscriptions))