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 JAVA (judge verdict: Accepted)

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

public class Main {

	public static void main(String[] args) {
		// TODO ?????????????????????????????????????????????

		BufferedReader insBR = new BufferedReader(new InputStreamReader(System.in));
		//??£??????????????????????????????????????°
		String strLine = "";

		while(true){
			try{

				String strScan = insBR.readLine();
				if("".equals(strScan) || strScan == null){
					break;
				}else{
					strLine += strScan;
				}


			}catch(IOException e){
				System.out.println(e);
			}

		}

		//?°????????????????
		strLine = strLine.toLowerCase();
		//System.out.println("strLine:" + strLine);

		//str???????§£??????char[]???????´?
		char[] aryLine= strLine.toCharArray();
		//System.out.println("aryLine.length:" + aryLine.length);

		char x = 'a';

		//int[] intCount = new int[26];

		//a???z?????§?????°?????????
		for(int i = 'a'; i <= 'z'; i++){
			//??¢????????????????????????????????????????????°
			int intCount = 0;
			//????????????length?????°?????????
			for(int j = 0; j < aryLine.length; j++){

				//System.out.println("int i:" + i );

				int alphNum = aryLine[j];
				//System.out.println("alphNum:" + alphNum);
				//??¢???????????????????????????????????¢??????
				if( i == alphNum){
					//System.out.print("i:" + i + "/j:" + alphNum);
					//System.out.print(" ");
					intCount++;
				}
			}

			System.out.print(x++);
			System.out.println(" : " + intCount);

		}
	}

}