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)

/**
  * http://judge.u-aizu.ac.jp/onlinejudge/description.jsp?id=ITP1_8_C&lang=jp
  * Character - Counting Characters
  */
object Main {
  def main(args: Array[String]): Unit = {
    val lines = Iterator.continually(io.StdIn.readLine()).takeWhile(_ != null).mkString.toLowerCase
    val occurrences = ('a' to 'z').map(c => (c, lines.count(_ == c)))
    occurrences.foreach(occ => println(s"${occ._1} : ${occ._2}"))
  }
}