import java.util.Scanner

fun main(args: Array<String>) {
    val (sx, sy, tx, ty) = Scanner(System.`in`).use<Scanner, List<Int>> {
        listOf(it.nextInt(), it.nextInt(), it.nextInt(), it.nextInt())
        // −1000≦sx<tx≦1000
        // −1000≦sy<ty≦1000
    }
    val x = tx - sx
    val y = ty - sy

    //上にy右にx 下にy左にx 左に1上にy+1右にx+1下に1 右に1下にy+1左にx+1上に1
    val result = CharArray(y, {'U'}) + CharArray(x, {'R'}) +
            CharArray(y, {'D'}) + CharArray(x, {'L'}) +
            'L' + CharArray(y + 1, {'U'}) + CharArray(x + 1, {'R'}) + 'D' +
            'R' + CharArray(y + 1, {'D'}) + CharArray(x + 1, {'L'}) + 'U'

    println(result)
}