main = do
 [sx,sy,tx,ty] <- map read . words <$> getLine
 putStrLn $ back_forth (sx,sy) (tx,ty)

back_forth (sx,sy) (tx,ty) = first ++ second
  where
   first = u dy ++ r dx ++ u 1 ++ l (dx+1) ++ d (dy+1) ++ r 1
   second = r dx ++ u dy ++ r 1 ++ d (dy+1) ++ l (dx+1) ++ u 1
   dx = tx - sx
   dy = ty - sy

u n = replicate n 'U'
d n = replicate n 'D'
l n = replicate n 'L'
r n = replicate n 'R'