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 Kotlin (judge verdict: Wrong Answer)

val aToZ = ('a'..'z')
val countMap  = HashMap<Char, Int>().withDefault { 0 }

fun main(args: Array<String>) {
    while (true){
        val line = readLine()?.filter { it.isLetter() } ?: break
        if(line.isEmpty()) break
        line.forEach {
            val count = countMap.getValue(it)
            countMap.put(it, count + 1)
        }
    }
    aToZ.forEach {
        println("$it : ${countMap.getValue(it)}")
    }
}