# include <fstream>
# include <cstring>
# define DIM 2000010
# define SOL 1010
using namespace std;
ifstream fin("strmatch.in");
ofstream fout("strmatch.out");
int p[DIM],sol[SOL],n,m,k,i,l;
char a[DIM],b[DIM];
int main () {
    fin>>a+1>>b+1;
    n=strlen(a+1);
    m=strlen(b+1);
    for(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(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){
            l=p[l];
            k++;
            if(k<=1000)
                sol[k]=i-n;
        }
    }
    fout<<k<<"\n";
    if(k>1000)
        k=1000;
    for(i=1;i<=k;i++)
        fout<<sol[i]<<" ";
    fout<<"\n";
    return 0;
}