import string

import sys



input_str = ""



for i in sys.stdin:

    input_str += i



for i in range(26):

    char = string.ascii_lowercase[i]

    CHAR = string.ascii_uppercase[i]

    cnt = input_str.count(char) + input_str.count(CHAR)

    print(("{0} : {1}".format(char, cnt)))
import string

import sys



input_str = sys.stdin.read()



for i in range(26):

    char = string.ascii_lowercase[i]

    CHAR = string.ascii_uppercase[i]

    cnt = input_str.count(char) + input_str.count(CHAR)

    print(("{0} : {1}".format(char, cnt)))
import string
import sys

input_str = ""
for i in sys.stdin:
    input_str += i
for i in range(26):
    char = string.ascii_lowercase[i]
    CHAR = string.ascii_uppercase[i]
    cnt = input_str.count(char) + input_str.count(CHAR)
    print(("{0} : {1}".format(char, cnt)))

import string
import sys

input_str = sys.stdin.read()
for i in range(26):
    char = string.ascii_lowercase[i]
    CHAR = string.ascii_uppercase[i]
    cnt = input_str.count(char) + input_str.count(CHAR)
    print(("{0} : {1}".format(char, cnt)))

-input_str = "" -for i in sys.stdin: -    input_str += i +input_str = sys.stdin.read()