object caesar extends App {
  def cifrar(or: String,  clave: Int):String = {
    for (c<-or) yield if (c.isLetter)((c.toUpper.toInt+clave)%26+'A'.toInt).toChar else c
  }
  def descifrar(or: String,  clave:Int):String = {
    for (c<-or) yield if (c.isLetter)((c.toUpper.toInt-clave)%26+'A'.toInt).toChar else c
  }
  println("Introduzca texto a cifrar:")
  val orig = readLine()
  println("Introduzca valor clave:")
  val clave = readInt()
  val cifrado = cifrar(orig,clave)
  println("Su texto cifrado es: " + cifrado)
  println("descifrado a :" + descifrar (cifrado, clave))

}