#include <fstream>
#include <cstring>
using namespace std;
ifstream cin ("strmatch.in");
ofstream cout ("strmatch.out");
string s, s1, s2;
int pi[2000005];
int sol[2000005];
int main()
{
    int n, m, i, cnt = 0;
    cin >> s1;
    cin >> s2;
    s = s1 + '#' + s2;
    for (i = 1; i < s.size(); i++)
    {
        int now = pi[i - 1];
        while (now && s[i] != s[now])
            now = pi[now - 1];
        if (s[i] == s[now])
            now++;
        pi[i] = now;
        if (pi[i] == s1.size())
            sol[++cnt] = i - 2 * s1.size();
    }
    cout << cnt << '\n';
    for (i = 1; i <= min(cnt, 1000); i++)
        cout << sol[i] << " ";
    return 0;
}