import scala.io.StdIn._

object Main extends App {

  val Array(sx,sy,tx,ty) = readLine().split(" ").map(_.toInt)

  def solve() = {
    val w = tx-sx
    val h = ty-sy
    "R" * w +
    "U" * h +
    "L" * w +
    "D" * (h+1) +
    "R" * (w+1) +
    "U" * (h+1) +
    "L" +
    "U" +
    "L" * (w+1) +
    "D" * (h+1) +
    "R"
  }

  println(solve())

}

