#include <fstream>
#include <cstring>

using namespace std;

char a[2000001],b[2000001];
int pi[2000001],pos[1001];

void citire(){
    ifstream f("strmatch.in");
    f>>a;
    f.get();
    f>>b;
    f.close();
}

void prefix(){
    int n=strlen(a)-1;
    int q=-1;
    pi[0]=-1;
    for(int i=1;i<=n;i++){
        while(q>=0&&a[q+1]!=a[i]){
            q=pi[q];
        }
        if(a[q+1]==a[i]) q++;
        pi[i]=q;
    }
}

int subsiruri(){
    int i,n=0,q=-1;
    int ni=strlen(a)-1;
    int m=strlen(b)-1;
    prefix();
    for(i=0;i<=m;i++){
        while(q>=0&&a[q+1]!=b[i]){
            q=pi[q];
        }
        if(a[q+1]==b[i])
            q++;
        if(q==ni){
            q=pi[q];
            n++;
            if(n<=1000){
                pos[n]=i-ni;
            }
        }

    }
    return n;
}

void afisare(int n){
    ofstream g("strmatch.out");
    g<<n<<"\n";
    if(n>1000) n=1000;
    for(int i=1;i<=n;i++){
        g<<pos[i]<<" ";
    }
    g<<"\n";
}

int main()
{
    citire();
    int n=subsiruri();
    afisare(n);
    return 0;
}