#include <bits/stdc++.h>

using namespace std;

int main()
{
	int n, s;
	while (cin >> n >> s, n || s) {
		int ans = 0;

		for (int i = 0; i < (1<<10); ++i) {
			int cnt = 0, sum = 0;

			for (int j = 0; j < 10; ++j) {
				if (i >> j & 1) {
					sum += j;
					cnt++;
				}
			}

			if (cnt == n && sum == s) ans++; 
		}

		printf("%d\n", ans);
	}
}