fun main(args: Array<String>) {
    val (sx, sy, tx, ty) = readLine()!!.split(" ").map(String::toInt)
    val w = tx - sx
    val h = ty - sy
    val r = StringBuilder(((w + h) shl 2) + 8)
    for (i in 1..h) r.append('U')
    for (i in 1..w) r.append('R')

    for (i in 1..h) r.append('D')
    for (i in 1..w) r.append('L')

    r.append('L')
    for (i in 1..h + 1) r.append('U')
    for (i in 1..w + 1) r.append('R')
    r.append('D')

    r.append('R')
    for (i in 1..h + 1) r.append('D')
    for (i in 1..w + 1) r.append('L')
    r.append('U')
    println(r)
}
