program ABC051C
    implicit none
    integer(8)::i,sx,sy,tx,ty
    read(5,*)sx,sy,tx,ty
    do i=1,tx-sx
        write(*,fmt='(A)',advance='no')"R"
    end do

    do i=1,ty-sy
        write(*,fmt='(A)',advance='no')"U"
    end do

    do i=1,tx-sx
        write(*,fmt='(A)',advance='no')"L"
    end do

    do i=1,ty-sy+1
        write(*,fmt='(A)',advance='no')"D"
    end do

    do i=1,tx-sx+1
        write(*,fmt='(A)',advance='no')"R"
    end do

    do i=1,ty-sy+1
        write(*,fmt='(A)',advance='no')"U"
    end do

    write(*,fmt='(A)',advance='no')"L"
    write(*,fmt='(A)',advance='no')"U"

    do i=1,tx-sx+1
        write(*,fmt='(A)',advance='no')"L"
    end do

    do i=1,ty-sy+1
        write(*,fmt='(A)',advance='no')"D"
    end do

    print'(A)',"R"
end program ABC051C