fun main(args:Array<String>){
    val l = readLine()!!.split(" ").map {it.toInt()}
    val sx = l[0]
    val sy = l[1]
    val tx = l[2]
    val ty = l[3]
    var x = sx
    var y = sy
    var first = String()
    var second = String()
    var result = String()
    for(i in 1..(tx+ty-sx-sy)){
        if((y-sy)*(tx-sx)>=(ty-sy)*(x+1-sx)){
            x++
            first = first.plus("R")
        }else{
            y++
            first = first.plus("U")
        }
    }
    for(i in 1..(tx+ty-sx-sy)-1){
        if((y-sy)*(tx-sx)<(ty-sy)*(x-1-sx)){
            x--
            second = second.plus("L")
        }else{
            y--
            second = second.plus("D")
        }
    }
    second = second.plus("L")

    result = first.plus(second).plus("LU").plus(first).plus("RDRD").plus(second).plus("LU")
    println(result)
}