import Foundation

let a = readLine()!
let b = a.components(separatedBy: " ")

let sx = Int(b[0])!
let sy = Int(b[1])!
let tx = Int(b[2])!
let ty = Int(b[3])! //ok


for i in 0..<ty-sy{
    
    print("U", terminator:"")

}


for i in 0..<tx-sx{
    
    print("R", terminator:"")

}


for i in 0..<ty-sy{
    
    print("D", terminator:"")

}


for i in 0..<tx-sx+1{
    
    print("L", terminator:"")

}


for i in 0..<ty-sy+1{
    
    print("U", terminator:"")

}


for i in 0..<tx-sx+1{
    
    print("R", terminator:"")

}


print("D",terminator:"")
print("R",terminator:"")


for i in 0..<ty-sy+1{
    
    print("D", terminator:"")

}

for i in 0..<tx-sx+1{
    
    print("L", terminator:"")

}


print("U")
