import java.util.Scanner

object Main {
  def main(args: Array[String]): Unit = {
    val sc = new Scanner(System.in)
    val sx, sy, tx, ty = sc.nextInt()

    //step1
    step(tx - sx, 'R')
    //step2
    step(ty - sy + 1, 'U')
    //step3
    step(tx - sx + 1, 'L')
    //step4
    step(ty - sy + 1, 'D')
    //step5
    step(1, 'R')

    //step6
    step(ty - sy, 'U')
    //step7
    step(tx - sx + 1, 'R')
    //step8
    step(ty - sy + 1, 'D')
    //step9
    step(tx - sx + 1, 'L')
    //step10
    step(1, 'U')
    println()
  }

  def step(n: Int, w: Char): Unit = {
    for (_ <- 0 until n) print(w)
  }
}