import scala.io.{ StdIn => in}

object Main extends App {
  val Array(sx, sy, tx, ty) = in.readLine.split(" ").map(_.toInt)

  val ans = {
    val c1x = tx - sx
    val c1y = ty - sy
    val c2x = c1x + 1
    val c2y = c1y + 1

    val res = StringBuilder.newBuilder

    (1 to c1x).foreach(_ => res.append('R'))
    (1 to c1y).foreach(_ => res.append('U'))
    (1 to c1x).foreach(_ => res.append('L'))
    (1 to c1y).foreach(_ => res.append('D'))
    res.append('D')
    (1 to c2x).foreach(_ => res.append('R'))
    (1 to c2y).foreach(_ => res.append('U'))
    res.append('L')
    res.append('U')
    (1 to c2x).foreach(_ => res.append('L'))
    (1 to c2y).foreach(_ => res.append('D'))
    res.append('R')
    res.toString
  }

  println(ans)
}