import java.util.Scanner

object Main extends App {
  val sc = new Scanner(System.in)

  val sx = sc.nextInt
  val sy = sc.nextInt
  val tx = sc.nextInt
  val ty = sc.nextInt

  val dx = tx - sx
  val dy = ty - sy

  val r1 = List.fill(dy)("U").mkString + List.fill(dx)("R").mkString
  val r2 = List.fill(dy)("D").mkString + List.fill(dx)("L").mkString
  val r3 = "L" + List.fill(dy + 1)("U").mkString + List.fill(dx + 1)("R").mkString + "D"
  val r4 = "R" + List.fill(dy + 1)("D").mkString + List.fill(dx + 1)("L").mkString + "U"

  val res = r1 + r2 + r3 + r4

  println(res)

}
