#include <bits/stdc++.h>
#define ll long long
#define ull unsigned long long
#define lsb(x) (x & (-x))

using namespace std;

const int MAXN = (int) 2e6 + 5;

char pat[MAXN + 1], str[MAXN + 1];
int pi[MAXN + 1];

int main() {
#ifdef HOME
	ifstream cin("C.in");
	ofstream cout("C.out");
#endif
	ifstream cin("strmatch.in");
	ofstream cout("strmatch.out");
	int i;
	ios::sync_with_stdio(false);
	cin.tie(0), cout.tie(0);

	cin >> (pat + 1) >> (str + 1);
	int n = strlen(pat + 1), m = strlen(str + 1);
	int k = 0;
	for(i = 2; i <= n; i++) {
		while(k > 0 && pat[k + 1] != pat[i]) {
			k = pi[k];
		}
		k += (pat[k + 1] == pat[i]);
		pi[i] = k;
	}
	vector <int> sol;
	k = 0;
	for(i = 1; i <= m; i++) {
		while(k > 0 && pat[k + 1] != str[i]) {
			k = pi[k];
		}
		k += (pat[k + 1] == str[i]);
		if(k == n && sol.size() < 1000) {
			sol.push_back(i - n);
		}
	}
	cout << sol.size() << "\n";
	for(auto it : sol) {
		cout << it << " ";
	}

	return 0;
}