local sx,sy,tx,ty=io.read("n","n","n","n")
local dx=tx-sx
local dy=ty-sy
local path=string.rep("U",dy)..string.rep("R",dx)..
        string.rep("D",dy)..string.rep("L",dx)..
        "L"..string.rep("U",dy+1)..string.rep("R",dx+1).."D"..
        "R"..string.rep("D",dy+1)..string.rep("L",dx+1).."U"
print(path)