#include <fstream>
#include <cstring>
using namespace std;

ifstream f("strmatch.in");
ofstream g("strmatch.out");

char A[2000005], B[2000005];
int N, M, pi[2000005], sol[2000005], dim, K;

void buildpi()
{
    for (int i=2; i<=N; ++i)
    {
        while (K!=0 && A[K+1]!=A[i]) K=pi[K];
        if (A[K+1]==A[i]) ++K;
        pi[i]=K;
    }
}

int main()
{
    f>>(A+1)>>(B+1);
    N=strlen(A+1); M=strlen(B+1);
    buildpi(); K=0;
    for (int i=1; i<=M; ++i)
    {
        while (K!=0 && A[K+1]!=B[i]) K=pi[K];
        if (A[K+1]==B[i]) ++K;

        if (K==N)
            sol[++dim]=i-N, K=pi[N];
    }

    g<<dim<<'\n';
    for (int i=1; i<=min(dim, 1000); ++i)
        g<<sol[i]<<' ';
    return 0;
}