let input = readLine()!.characters.split(" ").map{Int(String($0))!}
let (sx, sy, tx, ty) = (input[0], input[1], input[2], input[3])
let (dx, dy) = (tx-sx, ty-sy)
print("D", terminator: "")
(0...dx).forEach{_ in print("R", terminator: "")}
(0...dy).forEach{_ in print("U", terminator: "")}
(0...dx).forEach{_ in print("L", terminator: "")}
(0..<dy).forEach{_ in print("D", terminator: "")}
print("L", terminator: "")
(0...dy).forEach{_ in print("U", terminator: "")}
(0...dx).forEach{_ in print("R", terminator: "")}
(0...dy).forEach{_ in print("D", terminator: "")}
(0..<dx).forEach{_ in print("L", terminator: "")}