#include <bits/stdc++.h>

using namespace std;

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

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

vector<int>Kmp(const string &that) {
	vector<int>pi(that.size(), -1);

	for (int i = 1; i < that.size(); ++i) {
		int j = pi[i - 1];

		while (j >= 0 and that[j + 1] != that[i]) {
			j = pi[j];
		}

		if (that[j + 1] == that[i])
			j++;

		pi[i] = j;
	}

	return pi;
}

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

	for (int i = a.size(); i < s.size(); ++i) {
		if (pi[i] == a.size() - 1) {
			match.push_back(i - 2 * a.size());
		}
	}

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

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