import java.util.Arrays

const val MOD: Long = (1e9+7).toLong()

fun main(args: Array<String>) {
    val (sx, sy, tx, ty) = readLine()!!.split(" ").map{it.toInt()}

    var yd = if (ty > sy) listOf('U', 'D') else listOf('D', 'U')
    var xd = if (tx > sx) listOf('R', 'L') else listOf('L', 'R')

    for (i in 1..Math.abs(tx-sx)) {
        print(xd[0])
    }
    for (i in 1..Math.abs(ty-sy)) {
        print(yd[0])
    }
    for (i in 1..Math.abs(tx-sx)) {
        print(xd[1])
    }
    for (i in 1..Math.abs(ty-sy)) {
        print(yd[1])
    }
    print(yd[1])
    for (i in 1..Math.abs(tx-sx)+1) {
        print(xd[0])
    }
    for (i in 1..Math.abs(ty-sy)+1) {
        print(yd[0])
    }
    print(xd[1])
    print(yd[0])
    for (i in 1..Math.abs(tx-sx)+1) {
        print(xd[1])
    }
    for (i in 1..Math.abs(ty-sy)+1) {
        print(yd[1])
    }
    println(xd[0])
}
