// Back and Forth

func main() {
    let values = readLine()!.split(separator: " ").map{Int($0)!}
    let sx = values[0]
    let sy = values[1]
    let tx = values[2]
    let ty = values[3]

    let dx = tx - sx
    let dy = ty - sy
    var s = ""

    // 最初のゴールまで
    s += String(repeating: "R", count: dx)
    s += String(repeating: "U", count: dy)

    // 戻ってくる
    s += String(repeating: "L", count: dx)
    s += String(repeating: "D", count: dx)

    // 別ルートでゴールへ
    s += "D"
    s += String(repeating: "R", count: dx+1)
    s += String(repeating: "U", count: dy+1)
    s += "L"

    // 別ルートで戻ってくる
    s += "U"
    s += String(repeating: "L", count: dx+1)
    s += String(repeating: "D", count: dy+1)
    s += "R"

    print(s)
}

main()