///kmp deduction
///lps longest prefix == sufix

#include <fstream>
#include <vector>

using namespace std;

ifstream cin ("strmatch.in");
ofstream cout ("strmatch.out");

const int N = 4e6 + 10;
int pi[N + 1];

int n, st, dr, nr;

vector <int> v;

string path, s;

void kmp ()
{
    for (int i = 1; i < s.size(); ++i)
    {
        int val = pi[i - 1];
        while (val > 0 && s[val] != s[i])
            val = pi[val - 1];
        if (s[val] == s[i])
            ++val;
        pi[i] = val;
        if (pi[i] == n && i > n)
            ++nr, v.push_back(i - n * 2);
    }
}

int main()
{
    cin >> path >> s;
    n = path.size();
    s = path + '@' + s;
    kmp ();
    cout << nr << '\n';
    for (int i = 0; i < min (1000, (int)v.size()); ++i)
        cout << v[i] << ' ';
    return 0;
}