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;
import java.util.HashMap;

public class Main {
    public static void main(String[] args) throws IOException {
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        HashMap<Character,Integer> map = new HashMap<>();
        for(int i=0;i<26;i++){
            map.put((char)('a'+i),0);
        }
        String str,str1;
        while((str = br.readLine())!=null){
            str1 = str.toLowerCase();
            for(int i=0;i<str1.length();i++){
                char c = str1.charAt(i);
                if(map.containsKey(c)){
                    map.put(c,map.get(c)+1);
                }
            }
        }
        for(HashMap.Entry<Character,Integer> entry:map.entrySet()){
            System.out.println(entry.getKey()+" : "+entry.getValue());
        }
    }
}