object Main extends App {
  val sc = new java.util.Scanner(System.in)
  val sx, sy, tx, ty = sc.nextInt()
  val dx = tx - sx
  val dy = ty - sy
  val ans = s"${"R" * dx}${"U" * dy}${"L" * dx}${"D" * (dy+1)}${"R" * (dx+1)}${"U" * (dy+1)}LU${"L" * (dx + 1)}${"D" * (dy+1)}R"
  println(ans)
}
