#include <bits/stdc++.h>
using namespace std;
ifstream f("strmatch.in");
ofstream g("strmatch.out");
string pat, s;
vector<int> lps;
void preproc()
{
    lps.resize(pat.size(), 0);
    for (int j = 1, len = 0; j < pat.size();)
        if (pat[j] == pat[len])
            len++, lps[j] = len, j++;
        else if (len)
            len = lps[len - 1];
        else
            j++;
}
int main()
{
    f >> pat >> s;
    preproc();
    vector<int> rez;
    for (int i = 0, j = 0; i < s.size();)
    {
        if (s[i] == pat[j])
            i++, j++;
        if (j == pat.size())
            rez.push_back(i - j), j = lps[j - 1];
        else if (i < s.size() && pat[j] != s[i])
            if (j)
                j = lps[j - 1];
            else
                i++;
    }
    g << rez.size() << '\n';
    if (rez.size() > 1000)
        rez.resize(1000);
    for (auto i : rez)
        g << i << " ";
    return 0;
}