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)

'use strict';
(function(stdin) {
  var lines  = stdin.toString();
  var result = (function(data) {

    var hashmap = data.filter(function(v) {
        return /[A-Za-z]/.test(v);
    })
    .map(function(v) {
      return v.toLowerCase();
    })
    .reduce(function(map,key) {
      map[key]++;
      return map;
    },{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}
    );

    return Object.keys(hashmap).map(function(key) {
      return key + ' : ' + hashmap[key];
    }).join('\n');

  }(lines.split('')
  ));
  console.log(result);
}(require('fs').readFileSync('/dev/stdin', 'utf8')));