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;
using System.Threading.Tasks;

namespace ConsoleApplication2
{
    class Program
    {
        static void Main(string[] args)
        {
            //アルファベットの配列を作成。
            char[] chAlphabet = new char[26];
            char chText = 'a';
            for(int suffix = 0; suffix < 26; suffix++){
                chAlphabet[suffix] = chText;
                chText++;
            }
            
            int[] alphabetCount = new int[26];
            
            //入力読取。
           while(true){
               string strWord = Console.ReadLine();
               if(strWord != null && strWord != ""){
                   char[] chWord = strWord.ToCharArray();
                   for(int wordNum = 0; wordNum < chWord.Length; wordNum++){
                       chWord[wordNum] = Char.ToLower(chWord[wordNum]);
                       
                         //文字をカウント。
                       for(int alphabet = 0; alphabet < 26; alphabet++){
                           if(chWord[wordNum] == chAlphabet[alphabet]){
                               alphabetCount[alphabet]++;
                           }
                       }
                       
                   }
                   

                   
               }else{
                   break;
               }
           }


            //出力
            for(int index = 0; index < 26; index++){
               Console.WriteLine("{0} : {1}", chAlphabet[index], alphabetCount[index]);  
            }
            
        }
    }

}