#include <fstream>

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

const int NMAX = 4000000;
int pi[NMAX + 5];

int main()
{
    string s1, s2;
    fin >> s1 >> s2;

    s2 = "$" + s1 + "$" + s2;
    int l1 = s1.size(), l2 = s2.size();

    for(int i = 2; i < l2; i++)
    {
        int k = pi[i - 1];

        while(s2[i] != s2[k + 1] && k)
            k = pi[k];

        if(s2[i] == s2[k + 1])
            k++;

        pi[i] = k;
    }

    int cnt = 0;
    for(int i = 0; i < l2; i++)
        if(pi[i] == l1)
            cnt++;

    fout << cnt << '\n';

    int cnt1 = 0;
    for(int i = 0; i < l2; i++)
    {
        if(cnt1 == 1000)
            break;

        if(pi[i] == l1)
        {
            cnt1++;
            fout << i - 2 * l1 - 1 << ' ';
        }
    }

    fin.close();
    fout.close();
    return 0;
}