#include <fstream>
#include <string>
using namespace std;

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

string a, b;
int p[4000001];

int main()
{
    int n, m, i, j, rasp[1001] = {};

    fin >> a >> b;
    n = a.size();
    m = b.size();
    a = a + "#" + b;

    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)
        {
            rasp[0]++;
            if (rasp[0] <= 1000)
                rasp[rasp[0]] = i-2*n;
        }
    }
    fout << rasp[0] << '\n';
    for (i = 1; i<=min (rasp[0], 1000); i++)
        fout << rasp[i] << ' ';
    return 0;
}