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.BufferedReader;
import java.io.InputStreamReader;

public class Main {

	public static void main(String[] args) {
		try {
			String[] alpha = { "a", "b", "c", "d", "e", "f", "g", "h", "i",
					"j", "k", "l", "m", "n", "o", "p", "q", "r", "s", "t", "u",
					"v", "w", "x", "y", "z" };
			int[] alpha_int = new int[26];

			BufferedReader stdReader = new BufferedReader(
					new InputStreamReader(System.in));
			String line;
			while ((line = stdReader.readLine()) != null) {

				int length1 = 0;
				int length2 = 0;

				for (int i = 0; i < line.length(); i++) {
					String s = line;
					length1 = s.length();
					for (int j = 0; j < 26; j++) {
						s = s.toLowerCase();
						s = s.replaceAll(alpha[j], "");
						length2 = s.length();
						alpha_int[j] += length1 - length2;
						s = line;
					}
				}

			}
			
			for (int i = 0; i < 26; i++) {
				System.out.print(alpha[i]);
				System.out.print(" : ");
				System.out.println(alpha_int[i]);
			}
			
		} catch (Exception e) {
			e.getStackTrace();
			System.exit(0);
		}
	}
}