9. Allocate 24 volunteer slots to 3 schools, then the number of ways to allocate such that each school gets at least one slot and the number of slots for each school is different is $\qquad$ kinds.
The number of ways to allocate 24 volunteer slots to 3 schools, with each school getting at least one slot, is $C_{23}^{2}=$ 253; the number of ways to allocate the slots such that all 3 schools receive the same number of slots is 1; the number of ways to allocate the slots such that exactly 2 schools receive the same number of slots (i.e., satisfying $2 x+z=24$ and $x \neq z$ with positive integer solutions) is $10 \times 3=30$. Therefore, the number of ways to allocate the slots such that all 3 schools receive different numbers of slots is $253-1-30=222$.