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: Runtime Error)

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

public class Main {
	public static void main(String[] age)throws IOException{
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
		StringBuffer sb = new StringBuffer();

		int number[] = new int[26];
		String AlHA = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
		String alha = "abcdefghijklmnopqrstuvwxyz";
		int i = 0;
		int j = 0;
		String a;

		while(true){
			String input = br.readLine();
			for( i=0 ; i<input.length() ; i++ ){
				for( j=0 ; j<26 ; j++ ){
					a = input.substring(i, i+1);
					if( a.equals(AlHA.substring(j, j+1)) || a.equals(alha.substring(j, j+1))){
						number[j]++;
					}
				}
			}
			a = input.substring(i-1,i);
			if( a.equals(".")) break;
		}

		for( i=0 ; i<26 ; i++ ){
			sb.append(alha.substring(i, i+1)).append(" : ").append(Integer.toString(number[i])).append("\n");
		}
		System.out.print(sb);
	}
}