program main
implicit none
integer :: sx, sy, tx, ty
integer :: ix, iy, i, j, k
character :: res*20000

read(*,*) sx, sy, tx, ty

i = tx -sx
j = ty -sy
k = 1
do ix = k, k+i-1
   res(ix:ix) = 'R'
end do
k = k+i
do iy = k, k+j-1
   res(iy:iy) = 'U'
end do
k = k+j
do ix = k, k+i-1
   res(ix:ix) = 'L'
end do
k = k+i
do iy = k, k+j-1 
   res(iy:iy) = 'D'
end do
k = k+j
res(k:k) = 'D'
k = k+1
do ix = k, k+i
   res(ix:ix) = 'R'
end do
k = k+i+1
do iy = k, k+j
   res(iy:iy) = 'U'
end do
k = k+j+1
res(k:k+1) = 'LU'
k = k+2
do ix = k, k+i
   res(ix:ix) = 'L'
end do
k = k+i+1
do iy = k, k+j
   res(iy:iy) = 'D'
end do
k = k +j+1
res(k:k) = 'R'
write(*,*) res(1:k)


end program main
