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: Wrong Answer)

import java.util.Scanner;

public class Main {

	public static void main(String[] args) {

		String low_az = "abcdefghijklmnopqrstuvwxyz";
		String up_az =  "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
		String str="";
		int[] cnt;

		cnt = new int[low_az.length()];

		Scanner sc= new Scanner( System.in );

		while( sc.hasNext() ) {

			str = sc.nextLine();

			for ( int j = 0 ; j < str.length() ; j++ ) {
				for ( int i = 0 ; i < low_az.length() ; i ++ ) {
					if ( i == 0) {
						cnt[i] = 0;
					}
					if ( str.charAt(j) == low_az.charAt(i) || str.charAt(j) == up_az.charAt(i) ) {
						cnt[i]++;
					}
				}
			}
		}

		for ( int i = 0 ; i < low_az.length() ; i ++ ) {

			System.out.println( low_az.charAt(i) + " : " + cnt[i] );
		}
		sc.close();
	}
}