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)

object Main extends App {
  println(for {
    s <- readLine()
  } yield {
    if (s.isLower) s.toUpper else if (s.isUpper) s.toLower else s
  })
}