fun main(args: Array<String>) {
    abc051c()
}

private const val U = "U"
private const val D = "D"
private const val R = "R"
private const val L = "L"

fun abc051c() {
    val (sx, sy, tx, ty) = readLine()!!.split(" ").map { it.toInt() }

    val xDiff = tx - sx
    val yDiff = ty - sy


    val answer =
        U.repeat(yDiff) + R.repeat(xDiff) + D.repeat(yDiff) + L.repeat(xDiff + 1) + U.repeat(yDiff + 1) +
                R.repeat(xDiff + 1) + D + R + D.repeat(yDiff + 1) + L.repeat(xDiff + 1) + U

    println(answer)
}
