# include <fstream>
# include <cstring>
# define DIM 2000010
using namespace std;
ifstream fin("strmatch.in");
ofstream fout("strmatch.out");
char a[DIM],b[DIM];
int v[DIM],d[DIM],vec[DIM],n,m,i,t,sol;
int main () {
    fin>>a+1>>b+1;
    n=strlen(a+1);
    m=strlen(b+1);
    for(i=2;i<=n;i++){
        t=i-1;
        while(t!=0&&a[i]!=a[v[t]+1])
            t=v[t];
        if(a[i]==a[v[t]+1])
            v[i]=v[t]+1;
    }
    for(i=1;i<=m;i++){
        t=i-1;
        while(t!=0&&b[i]!=a[d[t]+1])
            t=d[t];
        if(b[i]==a[d[t]+1])
            d[i]=d[t]+1;
        if(d[i]==n)
            vec[++sol]=i-n;
    }
    fout<<sol<<"\n";
    for(i=1;i<=min(sol,1000);i++)
        fout<<vec[i]<<" ";
    fout<<"\n";
    return 0;
}