import java.util.Scanner
object Main extends App {
  val sc = new Scanner(System.in)
  val sx, sy, tx, ty = sc.nextInt
  val (dx, dy) = (tx - sx, ty - sy)
  val (u, d, l, r) = (
    Stream.continually('U'),
    Stream.continually('D'),
    Stream.continually('L'),
    Stream.continually('R'))
  println {
    (u.take(dy) ++ r.take(dx) ++ d.take(dy) ++ l.take(dx) ++
    l.take(1) ++
    u.take(dy + 1) ++ r.take(dx + 1) ++
    d.take(1) ++ r.take(1) ++
    d.take(dy + 1) ++ l.take(dx + 1) ++ u.take(1)).mkString
  }
}
