#!/bin/python3

import sys
from collections import defaultdict

n = int(input().strip())
unsorted = defaultdict(list)
lengths = set()
for _ in range(n):
    x = str(input().strip())
    l = len(x)
    lengths.add(l)
    unsorted[l].append(x)
lengths = list(lengths)
lengths.sort()
for i in lengths:
    unsorted[i].sort()
    for x in unsorted[i]:
        print(x)