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.io.IOException;
import java.util.Scanner;
public class Main {

	public static void main(String[] args) throws Exception{
		// TODO ?????????????????????????????????????????????
			Scanner sc = new Scanner(System.in);
			while(sc.hasNext()==true){
				String a = sc.nextLine();
				a = a.toLowerCase();
				int []b = new int[26];
				int c = a.length();
				char e;
				int f;
				for(int d=0 ; d<c ; d++){
					e = a.charAt(d);
					if((int)e>=97 && (int)e<=122){
						b[(int)e-97] += 1;
					}
				}
				for(char d=97 ; d<123 ; d++){
					System.out.println(d+" : "+b[d-97]);
				}
			}
	}
}