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 Python (judge verdict: Accepted)

import sys
 
chash = {}
for i in range( ord( 'a' ), ord( 'z' )+1 ):
    chash[ chr( i ) ] = 0
 
for line in sys.stdin:
    for i in range( len( line ) ):
        if line[i].isalpha():
            chash[ line[i].lower() ] += 1
 
for i in range( ord( 'a' ), ord( 'z' )+1 ):
    print( "{:s} : {:d}".format( chr( i ), chash[ chr( i ) ] ) )