#include <iostream>
//#include <fstream>
using namespace std;
int ans,n,s;

void dfs(int cnt,int sum,int i){
	if(sum>s||cnt>n||i>9){
		return;
	}
	if(sum==s&&cnt==n){
		++ans;
		return;
	}
	dfs(cnt,sum,i+1);
	dfs(cnt+1,sum+i,i+1);
	return;
};

int main(){
	while(cin>>n>>s&&n&&s){
		ans=0;
		dfs(0,0,0);
		cout << ans << "\n";
	}
	return 0;
}