Problem:
Counting Characters

Write a program which counts and reports the number of each alphabetical letter. Ignore the case of characters.

Input

A sentence in English is given in several lines.

Output

Prints the number of alphabetical letters in the following format:

a : The number of 'a'
b : The number of 'b'
c : The number of 'c'
.
.
z : The number of 'z'

Constraints

The number of characters in the sentence < 1200

Sample Input

This is a pen.

Sample Output

a : 1
b : 0
c : 0
d : 0
e : 1
f : 0
g : 0
h : 1
i : 2
j : 0
k : 0
l : 0
m : 0
n : 1
o : 0
p : 1
q : 0
r : 0
s : 2
t : 1
u : 0
v : 0
w : 0
x : 0
y : 0
z : 0

Solution in Python3 (judge verdict: Accepted)

import sys

s = sys.stdin.read().lower()
table = {
    "a": 0,
    "b": 0,
    "c": 0,
    "d": 0,
    "e": 0,
    "f": 0,
    "g": 0,
    "h": 0,
    "i": 0,
    "j": 0,
    "k": 0,
    "l": 0,
    "m": 0,
    "n": 0,
    "o": 0,
    "p": 0,
    "q": 0,
    "r": 0,
    "s": 0,
    "t": 0,
    "u": 0,
    "v": 0,
    "w": 0,
    "x": 0,
    "y": 0,
    "z": 0,
}

for i in list(s):
    if i in table:
        table[i] += 1
    else:
        continue

for i in table:
    print('{} : {}'.format(i,table[i]))