23.12.16

# n = int(input())

# data = list(map(int, input().split()))

# a = 0

# for i in range(n):

# print(str(1+i) + ':', end=' ')

# for j in range(n):

# if i == j:

# continue

# elif data[i] > data[j] :

# print('>', end=' ')

# elif data[i] < data[j]:

# print('<', end=' ')

# elif data[i]==data[j]:

# print('=', end=' ')

# print()

# n = int(input())

# data = [0] * (n + 1)

#

# for i in range(1, n):

# v = int(input())

# data[v] = 1

# for i in range(1, n + 1):

# if data[i] == 0:

# print(i)

a = input()

for i in range(26):

print(chr(ord('a')+i) +':')

'''

ASCII

American Standard Code

A: 65

a: 97

'0': 48

' ': 32

'''