object Main {
  def w(c: Char, n: Int): Unit = (0 until n) foreach (_ => System.out.print(c))

  def main(args: Array[String]): Unit = {
    val Array(sx, sy, tx, ty) = io.Source.fromInputStream(System.in).getLines().next().split(' ') map (_.toInt)

    val dx = tx - sx
    val dy = ty - sy
    // first
    w('U', dy)
    w('R', dx)
    w('D', dy)
    w('L', dx)

    // second
    w('L', 1)
    w('U', dy + 1)
    w('R', dx + 1)
    w('D', 1)
    w('R', 1)
    w('D', dy + 1)
    w('L', dx + 1)
    w('U', 1)

    System.out.println()
  }
}
