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)

import scala.collection.mutable.ListBuffer

object Main extends App {

  private val alphabets = Array.ofDim[Int](26)
  private val buff = ListBuffer.empty[String]
  val sc = new java.util.Scanner(System.in)
  while(sc.hasNext){
    buff += sc.next
  }
  
  buff.mkString("").foreach{ c =>
    val idx = c.toLower - 'a'
    if(idx >= 0) alphabets(idx) += 1
  }
  println(('a' to 'z').map(f => f.toString + " : " + alphabets(f - 'a')).mkString(f"%n"))
  
}