08 - Set difference() Operation.py

# ========================
#       Information
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# Direct Link: https://www.hackerrank.com/challenges/py-set-difference-operation/problem
# Difficulty: Easy
# Max Score: 10
# Language: Python

# ========================
#         Solution
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_ = int(input())
SET_N = set(map(int, input().split()))

_ = int(input())
SET_B = set(map(int, input().split()))

NEW_SET = SET_N.difference(SET_B)
print(len(NEW_SET))