#include <fstream>
#include <vector>
#define VAL 2000005

using namespace std;

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

int N, M, i, j;
int FF[VAL], poz;
string S, T;
vector<int> ANS;
vector<int> :: iterator it;

int main()
{
    fin >> S >> T;
    N=S.size();
    M=T.size();
    S='*'+S;
    T='*'+T;
    for (i=1; i<M; i++)
    {
        poz=FF[i];
        while (poz>0 && T[i+1]!=S[poz+1])
          poz=FF[poz-1];
        if (T[i+1]==S[poz+1])
          FF[i+1]=poz+1;
        if (FF[i+1]==N)
          ANS.push_back(i+1-N);
        //fout << FF[i+1] << " ";
    }
    fout << ANS.size() << '\n';
    for (it=ANS.begin(); it!=ANS.end(); it++)
      fout << *it << " ";
    fin.close();
    fout.close();
    return 0;
}