main = do
    [sx_, sy_, tx_, ty_] <- return . map read . words =<< getLine
    let
	dx = tx_ - sx_
	dy = ty_ - sy_
	up = replicate dy 'U'
	right = replicate dx 'R'
	left = replicate (dx+1) 'L'
	down = replicate (dy+1) 'D'
	urPass = up++right++"U"++left++down++"R"
	ruPass = right++up++"R"++down++left++"U"
    putStr $ urPass++ruPass