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 C# (judge verdict: Wrong Answer)

using System;
using System.Text;

public class Test
{
	public static void Main( )
	{
		string strs = Console.ReadLine().ToLower();
		int size = 'z'-'a'+1;
		Console.WriteLine( size );
		int[] cnt = new int[ size ];
		
		for( var i=0; i<strs.Length; i++ ) {
			if( char.IsLetter( strs[i] ) ) {
				Console.WriteLine( strs[i]-'a' );
				cnt[ strs[i]-'a' ]++;
			}
		}
		for( var i=0; i<size; i++ ) {
			Console.WriteLine( "{0} : {1}", Convert.ToChar('a'+i), cnt[i] );
		}
	}
}