#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using ull = unsigned long long;
#define EFC cin.tie(nullptr)->ios_base::sync_with_stdio(false)
int d1[5] = { 0, -1, 0, 1, 0 };
int d2[5] = { 0, 0, 1, 0, -1 };
const int mod = 666013;
const int INF = 100000000;
int d11[9] = { 0 , -1, -1, 0, 1, 1, 1, 0, -1 };
int d22[9] = { 0, 0, 1, 1, 1, 0, -1, -1, -1 };
int est[3] = { 0, -1, 0 };
int est1[3] = { 0, 0, 1 };
ifstream fin("strmatch.in");
ofstream fout("strmatch.out");


//----------------------------------

string a, b;
vector<int> v;
int pi[1000001];
int main() {

	fin >> a >> b;
	int n = a.length(), m = b.length();
	int k = 0;
	pi[1] = 0;
	for (int i = 2; i <= n; i++) {
		while (k > 0 && a[k] != a[i - 1]) {
			k = pi[k];
		}
		if (a[k] == a[i - 1]) {
			k++;
		}
		pi[i] = k;
	}
	int q = 0;
	for (int i = 1; i <= m; i++) {
		while (q > 0 && a[q] != b[i - 1]) {
			q = pi[q];
		}
		if (a[q] == b[i - 1]) {
			q++;
		}
		if (q == n) {
			v.push_back(i - n);
		}
	}

	fout << v.size() << '\n';
	for (auto i : v) {
		fout << i << " ";
	}
}