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.*;

public class Main {
  public static void main(String[] args) {
    BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
    try {
      int[] alphabet = new int[26];
      String str;
      while((str = reader.readLine()) != null) {
        str = str.toLowerCase();
        byte[] asciiStr = str.getBytes("US-ASCII");
        for (int i = 0; i < asciiStr.length; i++) {
          if (asciiStr[i] >= 97 && asciiStr[i] <= 122) {
            alphabet[asciiStr[i] - 97]++;
          }
        }
      }
      for (int i = 0; i < 26; i++) {
        System.out.printf("%c : %d\n", i + 97, alphabet[i]);
      }
    }
    catch (IOException e) {
      System.out.println(e);
    }
  }
}