import java.util.Scanner

object Main extends App {
  val sc = new Scanner(System.in)
  val Vector(sx, sy, tx, ty) = Vector.fill(4)(sc.nextInt)

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

  val ur1 = "U" * dy + "R" * dx
  val dl1 = "D" * dy + "L" * dx
  val ur2 = "LU" + ur1 + "RD"
  val dl2 = "RD" + dl1 + "LU"

  println(ur1 + dl1 + ur2 + dl2)
}
