#include<fstream>
#include<cstring>
using namespace std;
ifstream fin("strmatch.in");
ofstream fout("strmatch.out");
int p[2000003],n,m,i,L,v[1005],nr;
char b[2000003],a[2000003];
int main(){
    fin>>a+1;
    fin>>b+1;
    n=strlen(a+1);
    m=strlen(b+1);
    p[1]=0;
    L=0;
    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){
            nr++;
            L=p[L];
            if(nr<=1000){
                v[nr]=i-n;
            }
        }
    }
    fout<<nr<<"\n";
    if(nr>1000){
        nr=1000;
    }
    for(i=1;i<=nr;i++){
        fout<<v[i]<<" ";
    }
    return 0;
}