#include <bits/stdc++.h>

using namespace std;

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

int* precalc(const string& pat)
{
    int* lps = new int [pat.size()];
    lps[0]=0;
    for(int i=1;i<pat.size();i++)
    {
        if(pat[i]==pat[lps[i-1]])
        {
            lps[i]=lps[i-1]+1;
        }
        else
        {
            lps[i]=0;
        }
    }
    return lps;
}

vector<int> kmp(const string& pat, const string& txt)
{
    int* lps = precalc(pat);
    vector<int> sol;
    for(int i=0,j=0;i<txt.size();)
    {
        if(j==0 && pat[j] != txt[i])
        {
            i++;
            continue;
        }
        if(j==pat.size())
        {
            sol.push_back(i-pat.size());
            j=lps[j-1];
            continue;
        }
        if(pat[j] != txt[i])
        {
            j = lps[j-1];
            continue;
        }
        if(pat[j] == txt[i])
        {
            i++;
            j++;
        }
    }
    return sol;
}

int main()
{
    string pat,txt;
    fin>>pat>>txt;
    vector<int> sol = kmp(pat, txt);
    fout<<sol.size()<<'\n';
    for(auto q:sol)
    {
        fout<<q<<' ';
    }
    return 0;
}