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 scala.io.Source

object Main extends App {
  val line: String = Source.stdin.getLines.toList.head

  def isCapital(c: Char): Boolean = ('A' to 'Z').toList.contains(c)

  val str = line.map { c => if (isCapital(c)) c.toString.toLowerCase else c.toString.capitalize }

  str.map(print)
  println()
}