fun main(args: Array<String>) = yorukatsu17d()

fun yorukatsu17d() {
    val (startX, startY, toX, toy) = readLine()!!.split(' ').map { it.toInt() }

    val diffY = toy - startY
    val diffX = toX - startX

    val answer = buildString {
        append("U".repeat(diffY))
        append("R".repeat(diffX))
        append("D")
        append("L".repeat(diffX - 1))
        append("D".repeat(diffY - 1))
        append("L".repeat(2))
        append("U".repeat(diffY + 1))
        append("R".repeat(diffX + 1))
        append("D")
        append("R")
        append("D".repeat(2))
        append("L".repeat(diffX - 1))
        append("D".repeat(diffY - 1))
        append("L".repeat(2))
        append("U")
    }

    println(answer)
}
