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