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";
process.stdin.resume();
process.stdin.setEncoding('utf8');

var lines = []
var reader = require('readline').createInterface({
  input: process.stdin,
  output: process.stdout
});

reader.on('line', (line) => {
  lines.push(line);
});
/* 入力は 
 */

const ca = 'a'.charCodeAt(0);
const cz = 'z'.charCodeAt(0);
const chars = [...Array(cz - ca +1).keys()].map(x=>String.fromCharCode(x+ca));

reader.on('close', () => {
    var txt = lines.join('\n')

    var h = aux(txt)

    for (var c of chars) {
	console.log(c + ' : ' + h[c]);
    }
});


function aux(txt)
{
    var re=/[a-z]/;
    var h={};
    for (var c of chars) {
	h[c]=0;
    }

    for (var i=0; i<txt.length; i++) {
	var c = txt[i].toLowerCase()
	if (re.test(c)) {
	    h[c] += 1
	}
    }

    return(h);
}