#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 str[2 * MAXN + 1];
int z[2 * 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 >> (str + 1);
	int n = strlen(str + 1);
	str[n + 1] = '@';
	cin >> (str + n + 2);
	int m = strlen(str + n + 2);
	
	int sz = n + m + 1, pos = 0;
	z[1] = sz;
	for(i = 2; i <= sz; i++) {
		if(pos + z[pos] >= i) {
			z[i] = min(pos + z[pos] - i, z[i - pos + 1]);
		}
		while(i + z[i] <= sz && str[i + z[i]] == str[z[i] + 1]) {
			z[i]++;
		}
		if(i + z[i] > pos + z[pos]) {
			pos = i;
		}
	}
	vector <int> sol;
	int ans = 0;
	for(i = n + 2; i <= sz; i++) {
		if(z[i] == n) {
			ans++;
			if(sol.size() < 1000) {
				sol.push_back(i - n - 2);
			}
		}
	}
	cout << ans << "\n";
	for(auto it : sol) {
		cout << it << " ";
	}

	return 0;
}