#include<fstream>
#include<string>
#include<vector>

using namespace std;

string s,p,t;
int i,n;
int pi[4000003];
vector<int> sol;

int main()
{
    ifstream cin("strmatch.in");
    ofstream cout("strmatch.out");

    cin>>p>>t;
    s=p+'*'+t;
    n=s.size();
    for (i=1;i<n;i++)
    {
        int j=pi[i-1];
        while (j>0 && s[i]!=s[j])
            j=pi[j-1];
        if (s[i]==s[j]) j++;
        pi[i]=j;
    }
    /*for (i=0;i<n;i++)cout<<s[i]<<' ';cout<<'\n';
    for (i=0;i<n;i++)cout<<pi[i]<<' ';cout<<'\n';*/



    for (i=0;i<t.size();i++)
        if (pi[1+p.size()+i]==p.size())
        sol.push_back(i-p.size()+1);

    int k=sol.size();

    cout<<k<<'\n';

    for (i=0;i<min(k,1000);i++)
        cout<<sol[i]<<' ';
    return 0;
}