integer sx,sy,tx,ty,dx,dy
character(10**5) ans
read*,sx,sy,tx,ty
dx=tx-sx;dy=ty-sy
ans=""
ans=trim(ans)//repeat("R",dx)//repeat("U",dy)
ans=trim(ans)//repeat("L",dx)//repeat("D",dy)
ans=trim(ans)//"D"//repeat("R",dx+1)//repeat("U",dy+1)//"L"
ans=trim(ans)//"U"//repeat("L",dx+1)//repeat("D",dy+1)//"R"
print"(A)",trim(ans)
end