Задание 27 (№ 13503 с Решу ЕГЭ)

#coding: utf-8

a = [0] * 10

n = int(input())
for i in range(n):
    x = int(input())
    while x > 0:
        a[x % 10] += 1
        x //= 10

mx = -1
for i in range(n):
    if a[i] > mx:
        mx = a[i]

j = 9
for i in range(1, n + 1):
    if a[-i] == mx:
        print(j)
    j -= 1