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 JavaScript (judge verdict: Accepted)

(function(input) {
    var l = [];
    for (var i = 'a'.charCodeAt(0); i <= 'z'.charCodeAt(0); i++) {
        l[String.fromCharCode(i)] = 0;
    }

    input.split('').forEach(function(e) {
        e = e.toLowerCase();
        if (e in l) {
            l[e]++;
        }
    });
    console.log(Object.keys(l).map(function(k) {
        return k + ' : ' + this[k];
    }, l).join('\n'));
})(require('fs').readFileSync('/dev/stdin', 'utf8'));