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;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace ConsoleApplication13
{

    //ONLINE JUDGE (ITP1_8_C)

    class Program
    {
        static void Main(string[] args)
        {

            string alphabet = "abcdefghijklmnopqrstuvwxyz";
            int[] countAlphabet = new int[alphabet.Length];

            while (true)
            {
                string str = Console.ReadLine();

                if (str == null || str.Length == 0)
                {
                    break;
                }

                string st = str.ToLower();
                    
                    for (int j = 0; j < st.Length; ++j)
                    {
                        int index = alphabet.IndexOf(st[j]);
                        
                        if (index == -1)
                        {
                            continue;
                        }
                        ++countAlphabet[index];
                       
                    }            
                
            }
            for (int i = 0; i < countAlphabet.Length; ++i)
            {
                Console.WriteLine("{0} : {1}", alphabet[i], countAlphabet[i]);
            } 
        }
    }
}