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)

#! python3
# counting_characters.py

import sys

sents = [line.strip() for line in sys.stdin.readlines()]
dic = {chr(x):0 for x in range(ord('a'), ord('z')+1)}

for sent in sents:
    for c in sent:
        x = c.lower()
        if ord('a') <= ord(x) and ord(x) <= ord('z'):
            dic[x] += 1

for k, v in dic.items():
    print(k + ' : ' + str(v))