
loop do
	input=gets.split(" ")
	n=input[0].to_i
	s=input[1].to_i
	i=0

	if n == 0
		break
	end
	number=(0..9).to_a

	combi=number.combination(n).to_a


	for x in 0..combi.size-1
		if combi[x].inject(0){|result,item| result + item} == s
			i += 1
		end
	end

	puts i
end