#include <bits/stdc++.h>

using namespace std;

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

vector<int> z_function(const string &s) {
	int n = s.size();
	vector<int> z(n);
	for(int i = 1, l = 0, r = 0; i < n; i++) {
		if(i <= r) {
			z[i] = min(r - i, z[i - l]);
		}
		while(i + z[i] < n && s[z[i]] == s[i + z[i]]) {
			z[i]++;
		}
		if(i + z[i] > r) {
			r = i + z[i];
			l = i;
		}
	}
	return z;
}

int main() {
	string t, s;
	fin >> t >> s;
	int n = t.size();
	s = t + "@" + s;
	int m = s.size();
	vector<int> z = z_function(s);
	int cnt = 0;
	vector<int> ans;
	for(int i = n; i < m; i++) {
		if(z[i] == n) {
			cnt++;
			if(cnt <= 1000) {
				ans.emplace_back(i - n - 1);
			}
		}
	}
	fout << cnt << '\n';
	for(const auto &it: ans) {
		fout << it << " ";
	}
	return 0;
}