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

using namespace std;

char A[DIM],B[DIM];
int N,M,P[DIM],L;
vector <int> list;

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)
            list.push_back(i-N);
    }
    fout<<list.size()<<"\n";
    for(int i=0;i<list.size() && i<1000;i++)
        fout<<list[i]<<" ";
    fin.close();fout.close();
    return 0;
}