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 Scala (judge verdict: Accepted)

import java.lang.Character.{isUpperCase, isLowerCase}
import scala.io.StdIn.readLine

object Main extends App {

  val line = readLine()
  println(line.map(toggleCase))

  def toggleCase(c: Char): Char =
    if (isUpperCase(c)) c.toLower
    else if (isLowerCase(c)) c.toUpper
    else c
}