백준 9777번: Birthday Statistics #Python

import sys

input = sys.stdin.readline

month_count = [0] * (12 + 1)

N = int(input())

for _ in range(N):
    number, birth = input().rstrip().split()
    day, month, year = map(int, birth.split('/'))

    month_count[month] += 1

for i in range(1, 12 + 1):
    M = month_count[i]

    print(f'{i} {M}')