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)

//与えられた英文に含まれる、各アルファベットの数を数えるプログラムを作成して下さい。 なお、小文字と大文字は区別しません。
import java.util.Scanner;
public class Main{
  public static void main(String[] args){
    int [] count = new int[128];
    Scanner sc = new Scanner(System.in);
    while(sc.hasNext()){
      String str = sc.nextLine().toLowerCase();
      for(int i=0;i<str.length();i++){
        count[str.charAt(i)]++;
      }
    }
    for(char c='a';c<='z';c++){
      System.out.printf("%c : %d\n",c,count[c]);
    }

  }
}