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()

  var ans = ""
  for(i <- sx to tx-1)
    ans += "R"
  for(i <- sy to ty-1)
    ans += "U"
  for(i <- sx to tx-1)
    ans += "L"
  for(i <- sy to ty-1)
    ans += "D"

  ans += "U"
  for(i <- sx to tx)
    ans += "R"
  for(i <- sy to ty)
    ans += "U"
  ans += "L"

  ans += "U"
  for(i <- sx to tx)
    ans += "L"
  for(i <- sy to ty)
    ans += "U"
  ans += "R"

  println(ans)
}
