import java.lang.StringBuilder
import java.util.*

fun main(args: Array<String>) {
    val sc = Scanner(System.`in`)
    val sx = sc.nextInt()
    val sy = sc.nextInt()
    val tx = sc.nextInt()
    val ty = sc.nextInt()

    val answer = StringBuilder()
    val dy = Math.abs(ty - sy)
    val dx = Math.abs(tx - sx)

    // 1
    for (i in 1..dy) {
        answer.append("U")
    }
    for (i in 1..dx) {
        answer.append("R")
    }

    // 2
    for (i in 1..dy) {
        answer.append("D")
    }
    for (i in 1..dx) {
        answer.append("L")
    }

    // 3
    answer.append("L")
    for (i in 1..dy + 1) {
        answer.append("U")
    }
    for (i in 1..dx + 1) {
        answer.append("R")
    }
    answer.append("D")

    // 4
    answer.append("R")
    for (i in 1..dy + 1) {
        answer.append("D")
    }
    for (i in 1..dx + 1) {
        answer.append("L")
    }
    answer.append("U")

    println(answer)
}