#include <fstream>
#include <cstring>
#include <vector>
#define DIM 2000002

using namespace std;

char A[DIM],B[DIM];
int P[DIM],L;

int N,M;

vector <int> v;

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

int main(){

    fin >> A+1 >> B+1;

    N=strlen(A+1);
    M=strlen(B+1);

    L=0;
    P[1]=0;
    for(int i=2;i<=N;i++){
        while(L!=0 && A[i]!=A[L+1])
            L=P[L];

        if(A[i]==A[L+1])
            L++;
        P[i]=L;
    }

    L=0;

    for(int i=1;i<=M;i++){
        while(L!=0 && B[i]!=A[L+1])
            L=P[L];
        if(B[i]==A[L+1])
            L++;
        if(L==N)
            v.push_back(i-N);
    }

    fout << v.size() << "\n";

    for(int i=0;i<1000 && i<v.size();i++)
        fout << v[i] << " ";

    return 0;

}