#include <stdio.h>
#include <vector>

std::vector<int> ans;
int main()
{
	int a;
	long long int b;
	scanf("%d%lld",&a,&b);
	for(int i=a;i>=1;i--)
	{
		if(b>0)
		{
			int c = i<b?i:b;
			ans.push_back(c);
			b -= c;
		}
	}
	printf("%d\n",ans.size());
	for(int i=0;i<ans.size();i++) printf("%d ",ans[i]);
}