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.UnsupportedEncodingException;
import java.util.Scanner;

/**
 * Counting Characters
 */
public class Main {
    private static byte[] asciiCodes = new byte[26];
    private static int asc_a = 97;
    private static String alphabet;
    private static int alphabetSize = 26;

    public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);

        setAsciiCodes();
        String str;
        int [] count = new int[26];

        while (scan.hasNext()) {
            str = scan.nextLine();
            str = str.toLowerCase();
            for (int i = 0; i < str.length(); i++) {
                for (int y = 0; y < alphabetSize; y++) {
                    if (str.substring(i, i+1).equals(alphabet.substring(y, y+1))) {
                        count[y]++;
                    }
                }
            }
        }
        for (int p = 0; p < alphabetSize; p++) {
            System.out.println(alphabet.substring(p, p+1) + " " + ":" + " " + count[p]);
        }
    }

    private static void setAsciiCodes() {
        for (int i = 0; i < alphabetSize; i++) {
            asciiCodes[i] = (byte) asc_a;
            asc_a ++;
        }
        try {
            alphabet = new String(asciiCodes, "US-ASCII");
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        }
    }
}