#include <bits/stdc++.h>
using namespace std;

#ifndef HOME
	ifstream in("strmatch.in");
	ofstream out("strmatch.out");
	#define cin in
	#define cout out
#endif

string a, b;

int afis[1001];
int pi[4000001];

int main()
{
#ifdef HOME
    freopen("test.in", "r", stdin);
    freopen("test.out", "w", stdout);
#endif // HOME
	int cod = 0;
	cin >> a >> b;
	string s = a + "&" + b;
	pi[0] = -1;
	for(int i = 1; i < s.size(); i++)
	{
		pi[i] = pi[i - 1];
		while(pi[i] != -1 && s[pi[i] + 1] != s[i])
			pi[i] = pi[pi[i]];
		if(s[pi[i] + 1] == s[i])
			pi[i]++;
	}
	int cnt = 0;
	for(int i = a.size() + 1; i < s.size(); i++)
		if(pi[i] == a.size() - 1)
		{
			cnt++;
			if(cnt <= 1000)
				afis[cnt] = i - 2 * a.size();
		}
	cout << cnt << '\n';
	for(int i = 1; i <= min(cnt, 1000); i++)
		cout << afis[i] << " ";
    return 0;
}