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 {
  val offset: Int = 'a' - 'A'

  def main(args: Array[String]): Unit = {
    val toggled = io.StdIn.readLine().map { c =>
      if ('A' <= c && c <= 'Z') {
        (c + offset).toChar
      } else if ('a' <= c && c <= 'z') {
        (c - offset).toChar
      } else
        c
    }
    println(toggled)
  }
}