수강신청-13414.py

import sys

n_input = sys.stdin.readline

m, n = map(int, n_input().split())

dict = {}

for i in range(n):

    num = n_input().strip()

    dict[num] = i

ans = sorted(dict.items(), key=lambda x: x[1])

for i in range(k):

    if i >= len(ans):

        breaks

    print([i][0])