import Control.Arrow
import Control.Monad
import Data.List
import qualified Data.ByteString.Char8 as B

main :: IO ()
main = readLine >>= putStrLn . solve 

solve :: [Int] -> String
solve [sx, sy, tx, ty] = replicate ly 'U' ++ replicate lx 'R' ++ replicate ly 'D' ++ replicate (lx + 1) 'L' ++ replicate (ly + 1) 'U' ++ replicate (lx + 1) 'R' ++ "DR" ++ replicate (ly + 1) 'D' ++ replicate (lx + 1) 'L' ++ "U"
    where
        lx = tx - sx
        ly = ty - sy


readLine :: IO [Int]
readLine = unfoldr (\s -> second (maybe B.empty snd . B.uncons) <$> B.readInt s) <$> B.getLine

readContents :: Int -> IO [[Int]]
readContents = flip replicateM readLine