n = int(input())
lst = [0 for x in range(n)]

for i in range(n):
    lst[i] = input()

lst = list(set(lst))

for i in range(len(lst)):
    for j in range(len(lst)-1):
        if len(lst[i]) < len(lst[j]):
            lst[i], lst[j] = lst[j], lst[i]

for i in range(len(lst)):
    for j in range(i, len(lst)):
        if len(lst[i]) == len(lst[j]):
            lst[i], lst[j] = min(lst[i], lst[j]), max(lst[i], lst[j])

for i in lst:
    print(i)