while true
	begin
		x = gets.split
	rescue 
		break
	end
	n = x[0].to_i
	s = x[1].to_i
	if n*9>=s
		if s%9==0
			puts s/9*"9" + (n-(s/9))*"0"		
		else
			puts s/9*"9" + str(s%9) + (n-(s/9+1))*"0"
		end			
	else
		puts "-"
	end
end