main = do
  [sx,sy,tx,ty] <- map read . words <$> getLine :: IO [Int]
  let hori = tx-sx
  let vert = ty-sy
  let there1 = replicate vert 'U' ++ replicate hori 'R'
  let back1 = replicate vert 'D' ++ replicate hori 'L'
  let there2 = "L" ++ replicate vert 'U' ++ "UR" ++ replicate hori 'R' ++ "D"
  let back2 = "R" ++ replicate vert 'D' ++ "DL" ++ replicate hori 'L' ++ "U"
  putStrLn $ there1 ++ back1 ++ there2 ++ back2