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

using namespace std;

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

string A, B;
int T[2000001];
vector<int> sol;

int main()
{
    fin>>A>>B;
    for(int i=1;i<A.length();i++)
    {
        if(A[ T[i-1] ] == A[i])
            T[i] = 1 + T[i-1];
        else if(A[i]==A[0])
            T[i] = 1;
    }
    int k=0;

    for(int i=0;i<B.length();i++)
    {
        if(A[k] == B[i])
        {
            k++;
            if(k == A.size())
            {
                sol.push_back(i);
                k = T[k-1];
            }
        }
        else
        {
            while(k && A[k]!=B[i])
                k = T[k];
            if(A[k]==B[i])
            {
                k++;
                if(k == A.size())
                {
                    sol.push_back(i);
                    k = T[k-1];
                }
            }
        }
    }
    fout<<sol.size()<<'\n';
    for(unsigned int i=0;i<sol.size();i++)
        fout<<sol[i]-A.size()+1<<' ';

    fin.close();
    fout.close();
    return 0;
}