#include <cstdio>
#include <string>
#include <iostream>
#include <vector>
using namespace std;
string pattern, text;

int main() {
	freopen("strmatch.in", "r", stdin);
	freopen("strmatch.out", "w", stdout);

	cin.tie(NULL);
	ios_base::sync_with_stdio(false);

	cin >> pattern >> text;
	int N = pattern.size();
	string newString = pattern + "#" + text;
	int M = (int) newString.size();

	vector<int> pi(N, 0);
	vector<int> sol;
	sol.reserve(1000);
	int totalSolutions = 0, len = 0;
	for (int idx = 1; idx < M; idx++) {
		while (len > 0 && newString[idx] != newString[len]) {
			len = pi[len - 1];
		}
		if (newString[len] == newString[idx]) {
			len++;
		}

		if (idx < N) {
			pi[idx] = len;
		}
		if (len == N) {
			totalSolutions++;
			if (totalSolutions <= 1000) {
				sol.push_back(idx - 2 * N);
			}
		}
	}

	cout << totalSolutions << "\n";
	for (auto idx : sol) {
		cout << idx << " ";
	}
	cout << "\n";
	return 0;
}