#include <iostream>
#include <fstream>
#include <vector>
#include <algorithm>

using namespace std;

vector<int> zAlgorithm(const string& str)
{
    const int N = str.size();
    vector<int> z(N);

    int L = 0, R = 0;

    for (int i = 1; i < N; ++i)
    {
        if (i <= R)
            z[i] = min(R - i + 1, z[i - L]);

        while (i + z[i] < N && str[z[i]] == str[i + z[i]])
            z[i]++;

        if (i + z[i] - 1 > R)
        {
            L = i;
            R = i + z[i] - 1;
        }
    }

    return z;
}

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

    string A, B;
    in >> A >> B;

    auto z = zAlgorithm(A + "$" + B);
    vector<int> aparitii;

    for (int i = A.size() + 1; i < z.size(); ++i)
        if (z[i] == A.size())
            aparitii.push_back(i - A.size() - 1);

    out << aparitii.size() << endl;

    aparitii.resize(min((size_t)1000, aparitii.size()));

    for_each(aparitii.begin(), aparitii.end(), [&out](int x){out << x << " ";});

    return 0;
}