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 Scala (judge verdict: Accepted)

object Main{
  def main(args:Array[String]) = {
    val sc = new java.util.Scanner(System.in)
    val arr = List.fill(26)(0).toArray
    while (sc.hasNext){
      val chars = sc.next.toLowerCase.toCharArray
      chars.filter(c => 'a' <= c && c <= 'z').foreach(c => arr(c - 'a') += 1)
    }
    'a' to 'z' foreach(c => println(c + " : " + arr(c - 'a')))
  }
}