#include <iostream>
using namespace std;
int m,n;
bool a = true;
int main()
{
	cin >> m >> n;
	short ans = 0;
	if (m == 1)
		m = 2;
	for (int i = m;i <= n;i++)
	{
		for (int j = 2;j < i;j++)
		{
			if (i % j == 0)
				a = false;
		}
		if (a == true)
		{
			cout << i << ' ';
			ans++;
		}
		a = true;
	}
	cout << endl << ans;
	return 0;
}