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

public class Main {

	public static void main(String[] args) throws IOException {
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
		String str;
		int[] count = new int[26];
		while ((str = br.readLine()) != null) {
			str = str.toLowerCase();
			for (int i = 0; i < str.length(); i++) {
				char c = str.charAt(i);
				if (Character.isLetter(c)) {
					count[c - 'a']++;
				}
			}
		}
		for (int i = 0; i < count.length; i++) {
			System.out.print((char) ('a' + i));
			System.out.print(" : ");
			System.out.println(count[i]);
		}
	}
}