Problem:
Toggling Cases

Write a program which converts uppercase/lowercase letters to lowercase/uppercase for a given string.

Input

A string is given in a line.

Output

Print the converted string in a line. Note that you do not need to convert any characters other than alphabetical letters.

Constraints

The length of the input string < 1200

Sample Input

fAIR, LATER, OCCASIONALLY CLOUDY.

Sample Output

Fair, later, occasionally cloudy.

Solution in Kotlin (judge verdict: Accepted)

fun main(args: Array<String>) {
    println(readLine()!!.toCharArray().map{ c -> if(c.isLowerCase()) c.toUpperCase() else c.toLowerCase()}.joinToString(""))
}