#include <iostream>
#include <fstream>
#include <string>
#include <vector>

using namespace std;

int main(){
    ifstream in("strmatch.in");
    ofstream out("strmatch.out");

    string a, b; in >> a >> b;

    int k = 0;
    vector<int> pi(a.size());
    for (int i = 1; i < a.size(); i++) {
        while (k > 0 && a[k] != a[i]) {
            k = pi[k - 1];
        }
        if (a[k] == a[i]) {
            k++;
        }
        pi[i] = k;
    }

    k = 0;
    vector<int> match(b.size());
    // !! atentie !! aici i incepe de la 0
    for (int i = 0; i < b.size(); i++) {
        while (k > 0 && a[k] != b[i]) {
            k = pi[k - 1];
        }
        if (a[k] == b[i]) {
            k++;
        }
        match[i] = k;
    }

    vector<int> ans;
    for (int i = 0; i < b.size(); i++) {
        if (match[i] == a.size()) {
            ans.push_back(i - a.size() + 1);
        }
    }

    out << ans.size() << "\n";
    ans.resize(min(int(ans.size()), 1000));
    for (int i = 0; i < ans.size(); i++) {
        out << ans[i] << " ";
    }
    out << "\n";

    return 0;
}