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: Accepted)

using System;
 
class Program
{
    static void Main()
    {
    	var cnt = new int[26];
    	string s;
		
		while( null != ( s = Console.ReadLine()) ) {
	    	foreach(var c in s.ToLower().ToCharArray()) {
	    		if(c >= 'a' && c <= 'z') {
	    			cnt[c-'a']++;
	    		}
	    	}
		}
    	
    	for(int i = 0; i < 26; i++) {
    		char c = (char)('a' + i);
    		Console.WriteLine(c + " : " + cnt[i]);
    	}
    	
    }
}