#include <fstream>
#include <string>

using namespace std;
ifstream cin ("strmatch.in");
ofstream cout ("strmatch.out");
int rasp[4000005];
int main()
{
    int n,i,j,k,cate=0,cnt=0;
    string a,b;
    char d,c;
    cin>>a>>b;
    int val=a.size();
    a='$'+a;
    a=a+'&';
    a=a+b;
    for(i=2;i<a.size();i++)
    {
        k=rasp[i-1];
        c=a[i];
        d=a[k+1];
        while(a[i]!=a[k+1] && k>=1)
        {
            k=rasp[k];
        }
        if(a[i]==a[k+1])
        {
            rasp[i]=k+1;
        }
        else
        {
            rasp[i]=0;
        }
        if(rasp[i]==val)
        {
            cate++;
        }
    }
    cout<<cate<<'\n';
    cnt=0;
    for(i=1;i<a.size();i++)
    {
        if(rasp[i]==val)
        {
            cout<<i-val+1-val-2<<" ";
            cnt++;
            if(cnt==1000)
            {
                break;
            }
        }
    }
    return 0;
}