#include <bits/stdc++.h>
using namespace std;
ifstream fin("strmatch.in");
ofstream fout("strmatch.out");

string pattern, text;
string concat;

int main() {
	fin >> pattern >> text;
	concat = '$' + pattern + '$' + text;
	vector<int> lps(concat.size());
	for (int i = 2, j = 0; i < concat.size(); ++i) {
		while (j > 0 && concat[i] != concat[j + 1]) {
			j = lps[j];
		}
		if (concat[i] == concat[j + 1]) {
			++j;
		}
		lps[i] = j;
	}
	vector<int> occ;
	for (int i = 2 * pattern.size() + 1; i < concat.size(); ++i) {
		if (lps[i] == pattern.size()) {
			occ.push_back(i - 2 * pattern.size() - 1);
		}
	}
	fout << occ.size() << "\n";
	for (int i = 0; i < min((int)occ.size(), 1000); ++i) {
		fout << occ[i] << " ";
	}
}