투포인터로 진입순서와 비교 import sys input = sys.stdin.readline N = int(input()) deaguen = [input().rstrip() for _ in range(N)] check = {car: False for car in deaguen} youngsik = [input().rstrip() for _ in range(N)] idx = 0 cnt = 0 for last in youngsik: while check[deaguen[idx]]: idx += 1 if last == deaguen[idx]: idx += 1 else: cnt += 1 check[last] = True print(cnt)