#include <bits/stdc++.h>
using namespace std;
using llx = long long;

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

string a, b;
vector<int> p, rasp;

int main()
{
    int n, m, i, j, nr_rasp = 0;

    fin >> a >> b;
    n = a.size(), m = b.size();
    a = a + "#" + b;
    p.resize(n+m+1);
    p[0] = 0;

    for (i = 1; i<=n+m; i++)
    {
        j = p[i-1];
        while (j > 0 && a[i] != a[j])
            j = p[j-1];
        if (a[i] == a[j])
            j++;
        p[i] = j;

        if (p[i] == n)
        {
            nr_rasp++;
            if (rasp.size() < 1000)
                rasp.push_back(i-2*n);
        }
    }

    fout << nr_rasp << '\n';
    for (const auto &el : rasp)
        fout << el << ' ';
    return 0;
}