#include <bits/stdc++.h>
using namespace std;
ifstream f("strmatch.in");
ofstream g("strmatch.out");
// #define f cin
// #define g cout
int lg;
string s, a;
vector<int> pr, rez;
int main()
{
    f >> s >> a;
    lg = s.size();
    s += '~';
    s += a;
    pr.resize(s.size());
    for (int i = 1; i < (int)s.size(); i++)
    {
        pr[i] = pr[i - 1];
        while (pr[i] && s[pr[i]] != s[i])
            pr[i] = pr[pr[i] - 1];
        if (s[i] == s[pr[i]])
            pr[i]++;
        if (i > lg && pr[i] == lg)
            rez.push_back(i - lg - lg);
        if (rez.size() == 1000)
            break;
    }
    g << rez.size() << "\n";
    for (const int &i : rez)
        g << i << " ";
    return 0;
}