#include <fstream>
#include <vector>
#include <string>

using namespace std;

int main()
{
	ifstream fin("strmatch.in");
	ofstream fout("strmatch.out");
	string s, t;
	fin >> s >> t;
	int p = s.size();
	s = s + "$" + t;
	vector <int> pi(s.size() + 5, 0);
	for (int i = 1;i < s.size();++i)
	{
		for (pi[i] = pi[i - 1];pi[i] > 0 && s[pi[i]] != s[i];pi[i] = pi[pi[i] - 1]);
		if (s[pi[i]] == s[i])
			++pi[i];
	}
	vector <int> sol;
	int cnt = 0;
	for (int i = p + 1;i < s.size();++i)
	{
		if (pi[i] == p)
		{
			++cnt;
			if (cnt < 1000)
				sol.push_back(i - 2 * p);
		}
	}
	fout << cnt << "\n";
	for (auto &x : sol)
		fout << x << " ";
	fin.close();
	fout.close();
	return 0;
}