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