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;

namespace ConsoleApplication24
{
    class Program
    {
        static void Main(string[] args)
        {
            string alpha = "abcdefghijklmnopqrstuvwxyz";
            int[] Sum = new int[alpha.Length];
            while (true)
            {
                string input = Console.ReadLine();
                if (input == null || input.Length == 0)
                {
                    break;
                }
                else
                {
                    for (int i = 0; i < input.Length; i++)
                    {
                        for (int j = 0; j < alpha.Length; j++)
                        {
                            input = input.ToLower();
                            if ('a' <= input[i] && input[i] <= 'z')
                            {
                                if (input[i] == alpha[j])
                                    Sum[j] = Sum[j] + 1;
                            }
                         }
                     }
                 }
                
            }
            for (int k = 0; k < alpha.Length; k++)
            {
                Console.WriteLine(alpha[k] + " : " + Sum[k]);
            }
        }
    }
}