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: Wrong Answer)

using System;
using System.Text;

namespace ITP_8_C{
    public class Program{
        public static void Main(string[] args){
            
            string literal;
            int[] answer = new int[26];

            //?????°????????????
            while((literal = Console.ReadLine()) != null){

                //????????????????????????????????????
                for(int i=0; i<literal.Length; i++){
                    //A???char??§65???Z???char??§90->if(x<65 && 90<x ){x-65????????????add}
                    //a???char??§97???z???char??§122->if(x<97 && 122<x ){x-97????????????add}
                    if( 65 < literal[i] && literal[i] < 90){
                        answer[literal[i]-65]++;
                    }else if(97 < literal[i] && literal[i] < 122){
                        answer[literal[i]-97]++;
                    }
                }
            }
            Output(answer);
        }

        //?°???????????????????????????¨???????????????????????°???26(alphabet?????°)?????§???int????????????
        private static void Output(int[] answer){
            StringBuilder outputStr = new StringBuilder();

            outputStr.Append((char)(97));
            outputStr.Append(" : ");
            outputStr.Append(answer[0].ToString());
            
            for(int i=1; i<26; i++){
                //??????????????????????£??????´?????????
                outputStr.AppendLine();
                outputStr.Append((char)(97+i));
                outputStr.Append(" : ");
                outputStr.Append(answer[i].ToString());
            }

            Console.Write(outputStr.ToString());
        }
    }
}