#include <bits/stdc++.h>

using namespace std;

ifstream fin("strmatch.in");
ofstream fout("strmatch.out");

int n, m;
string a, b, s;

vector<int>Zalgo(const string &that) {
	vector<int>z(that.size(), 0);
	int l = 0, r = 0;

	for (int i = 1; i < that.size(); ++i) {
		if(i <= r) {
			z[i] = min(z[i - l], r - i);
		}
		while (i + z[i] < that.size() and s[z[i]] == s[i + z[i]]) {
			z[i]++;
		}

		if (i + z[i] > r) {
			r = i + z[i];
			l = i;
		}
	}

	return z;
}

int main() {
	fin >> a >> b;
	s = a + '$' + b;
	auto z = Zalgo(s);
	vector<int>match;

	for (int i = a.size()+1; i < s.size(); ++i) {
		if (z[i] == a.size()) {
			match.push_back(i - a.size() - 1);
		}
	}

	fout << match.size() << '\n';

	for (int i = 0; i < min(1000, (int)match.size()); ++i)
		fout << match[i] << ' ';

	return 0;
}