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 ConsoleApplication41
{
    class Program
    {
        static void Main(string[] args)
        {
            //??¢???????????????????????????
            string[] array = {
                                 "a","b","c","d","e","f","g","h","i","j",
                                 "k","l","m","n","o","p","q","r","s","t","u",
                                 "v","w","x","y","z"
                              };
            int[] sum = new int[array.Length];
            
            while (true)
            {
                string input = Console.ReadLine();
                //???????????£???????????????
                if(input == null || input.Length == 0)
                {
                    break;
                }
                //char?????????
                char[] chr = input.ToCharArray();
                for (int i = 0; i < chr.Length; i++ )
                {
                    //??§??????????°??????????
                    if (char.IsUpper(chr[i]))
                    {
                        chr[i] = char.ToLower(chr[i]);
                    }
                }
                int iLength = chr.Length;
                for (int i = 0; i < iLength; i++)
                {  
                    //string????????´???
                    string p = chr[i].ToString();
                        //???????????????
                        for (int x = 0; x < 26; x++)
                        {
                            if (array[x].Equals(p))
                            {
                                //????????£???????????????
                                if ('a' <= chr[i] || chr[i] <= 'z')
                                {
                                    sum[x] = sum[x] + 1;
                                }
                            }
                        }
                }
             }    
            
          
            for (int i = 0; i < array.Length; i++)
            {
                Console.WriteLine(array[i] + " " + ":" + " " + sum[i]);
            }
        }
    }
  }