#include <vector>
#include <fstream>
#include <cstring>
#define DIM 2000005

using namespace std;

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

int N,M;
char A[DIM],B[DIM];

int L,P[DIM];
vector <int> sol;

int main(){

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

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

    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)
            sol.push_back(i-N);
    }

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

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


}