object Main extends App {
	override def main(args: Array[String]){
		val sc = new java.util.Scanner(System.in)
		val input = sc.nextLine
		input.map{
			case ch:Char if ('a' to 'z') contains ch => (ch - 'a'+'A').asInstanceOf[Char]
			case ch:Char if ('A' to 'Z') contains ch => (ch - 'A'+'a').asInstanceOf[Char]
			case ch:Char => ch
		}.foreach(print)
		println
	}
}