import Data.List
main = getLine >>= putStrLn . solve . map read . words

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