fun main(args: Array<String>) 
{
    val (sx, sy, tx, ty) = readLine()!!.split(" ").map {x -> x.toInt()} //入力
    val dx = tx-sx
    val dy = ty-sy
    print("U".repeat(dy)+"R".repeat(dx)+"D".repeat(dy)+"L".repeat(dx))//内側の一往復
    println("L" + "U".repeat(dy + 1) + "R".repeat(dx + 1)  + "D" + 
            "R" + "D".repeat(dy + 1) + "L".repeat(dx + 1)  + "U")//外側の一往復
}