object Main extends App {
  val Array(sx, sy, tx, ty) = scala.io.StdIn.readLine.split(' ').map(_.toInt)

  val path1 = 'U' * (ty - sy) + 'R' * (tx - sx)
  val path2 = 'R' * (tx - sx) + 'U' + (ty - sy)
  val path3 = 'D' + 'R' * (tx - sx + 1) + 'U' + (ty - sy + 1) + 'L'
  val path4 = 'L' + 'U' * (ty - sy + 1) + 'R' * (tx - sx + 1) + 'D'

  println(Array(path1, path2, path3, path4).mkString)
}
