#include <fstream>
#include <cstring>
#include <vector>

using namespace std;

const int N = 2e6;
const int NMAX = 1000;

char a[N+N+2];
int pref[N+N+1];

int main()
{
    ifstream in("strmatch.in");
    ofstream out("strmatch.out");
    in >> a;
    int n = strlen(a);
    a[n] = '#';
    in >> (a + n + 1);
    int m = strlen(a);
    int lung = 0;
    vector <int> ap;
    for (int i = 1; i < m; i++)
    {
        while (lung > 0 && a[lung] != a[i])
        {
            lung = pref[lung-1];
        }
        if (a[lung] == a[i])
        {
            lung++;
        }
        pref[i] = lung;

        if (lung == n)
        {
            ap.push_back(i - 2 * n);
        }
    }
    out << ap.size() << "\n";
    int nr_sol = min(NMAX, (int)ap.size());
    for (int i = 0; i < nr_sol; i++)
    {
        out << ap[i] << " ";
    }
    in.close();
    out.close();
    return 0;
}