#include <bits/stdc++.h>
using namespace std;

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

string a, b;
int pi[2000005], nr;
vector<int> ans;

int main() {
	fin >> a >> b;

	for(int i = 1; i < a.length(); i++) {
		pi[i] = pi[i-1];
		while(pi[i] > 0 && a[i] != a[pi[i]])
			pi[i] = pi[pi[i]-1];

		if(a[i] == a[pi[i]]) pi[i]++;
	}

	int q = 0;
	for(int i = 1; i < b.length(); i++) {
		while(q > 0 && b[i] != a[q])
			q = pi[q-1];

		if(b[i] == a[q]) q++;

		if(q == a.length()) {
			if(ans.size() < 1000) ans.push_back(i-q+1);
			nr++;
		}
	}

	fout << nr << '\n';
	for(auto x : ans) fout << x << ' ';
}