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: Runtime Error)

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

public class Main {
	  public static void main(String[] args) {
		    try{
		        BufferedReader br=new  BufferedReader(new InputStreamReader(System.in));
		        int[] rc=new int[26];
		        String[] a={"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 sw;
		        String dat,str;
		         
		        while((dat=br.readLine())!=null){
		            dat=dat.toLowerCase();
		            int i=0;
		            while(i<dat.length()){
		                str = dat.substring(i,i+1);
		                int j=0;
		                sw=0;
		                while(sw==0){
		                    if(str.equals(" ") ||str.equals(".")) sw=1;
		                    if(str.equals(a[j])){
		                        rc[j] ++;
		                        sw=1;
		                    }else{
		                        j++;
		                    }
		                }
		                i++;
		            } 
		        }
		         
		        for(int i=0;i<a.length;i++){
		            System.out.println(a[i] + " : "+ rc[i]);
		        }
		    }catch(IOException e){
		    		e.printStackTrace();
		    }
		    	
	}
}