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: Wrong Answer)

object Main {
  def main(args: Array[String]): Unit = {
    val count = scala.collection.mutable.Map[Char, Int]()
    val in = io.Source.stdin.getLines.mkString("")
    for(c <- in) {
      if(c.isLetter) count(c.toLower) = count.getOrElse(c.toLower, 0) + 1
      if(c == '.') {
        for(c <- 'a' to 'z') println(s"$c : ${count.getOrElse(c, 0)}")
        System.exit(0)
      }
    }
  }
}