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.Collections.Generic;
//using System.Linq;
//using System.Text;
//using System.Threading;
using System.IO;
using System.Text;

//============================================================================
namespace Sweet
{
    class Program
    {
        static StreamWriter writer = null;
        //============================================================================
        static void setstdio(string[] args)
        {
            if (0 < args.Length)
            {
                // Redirect standard input from the console to the input file.
                Console.SetIn(new StreamReader(args[0]));
                if (args.Length == 2)
                {
                    // Attempt to open output file.
                    writer = new StreamWriter(args[1]);
                    // Redirect standard output from the console to the output file.
                    Console.SetOut(writer);
                }
            }
        }
        //============================================================================
        static int Swing()
        {
            int alpha = 26;
            int[] sum=new int[alpha];
            StringBuilder builder = new StringBuilder(Console.ReadLine());
            for (int i = 0; i < builder.Length; i++)
                if (isalpha(builder[i]))
                    sum[(builder[i] & 0x1f)-1]++;
            for (int i=0; i<alpha; i++)
                Console.WriteLine("{0} : {1}", (char)('a'+i), sum[i]);
            return 0;
        }

        private static bool isalpha(char v)
        {
            if ('a' <= v && v <= 'z' || 'A' <= v && v <= 'Z')
                return true;
            return false;
        }

        //============================================================================
        static void Main(string[] args)
        {
            setstdio(args);

            while(Swing()!=0);
            if (writer != null)
                writer.Close();
            //Console.ReadLine();
        }
        //============================================================================
    }
}