fun main(args: Array<String>) {

    val points = readLine()?.split(" ").orEmpty()
    val pointS = Pair(points[0].toInt(), points[1].toInt())
    val pointT = Pair(points[2].toInt(), points[3].toInt())

    val distX = Math.abs(pointS.first - pointT.first)
    val distY = Math.abs(pointS.second - pointT.second)

    var pathF1 = ""
    var pathB1 = ""
    var pathF2 = ""
    var pathB2 = ""

    for(i in 1 .. distX) {
        pathF1 += "R"
        pathF2 += "R"
        pathB1 += "L"
        pathB2 += "L"
    }
    for (i in 1 .. distY){
        pathF1 += "U"
        pathF2 = "U$pathF2"
        pathB1 += "D"
        pathB2 = "D$pathB2"
    }

    println(pathF1 + pathB1 + "LU" + pathF2 + "RD" + "RD" + pathB2 + "LU")


}