# include <fstream>
# include <cstring>
# define DIM 2000010
# define SOL 1010
#define MOD1 100007
#define MOD2 100021
using namespace std;
ifstream fin("strmatch.in");
ofstream fout("strmatch.out");
int sol[SOL],n,m,k,i,hb1,hb2,ha1,ha2,p=73,p1,p2,r1,r2;
char a[DIM],b[DIM];
int main () {
    fin>>a+1>>b+1;
    n=strlen(a+1);
    m=strlen(b+1);
    if(n>m){
        fout<<"0\n";
        return 0;
    }
    p1=p2=1;
    for(i=1;i<=n;i++){
        ha1=(p*ha1+a[i])%MOD1;
        ha2=(p*ha2+a[i])%MOD2;
        hb1=(p*hb1+b[i])%MOD1;
        hb2=(p*hb2+b[i])%MOD2;
        if(i!=1){
            p1*=p;
            p2*=p;
            p1%=MOD1;
            p2%=MOD2;
        }
    }
    if(ha1==hb1&&ha2==hb2)
        k++;
    for(i=n+1;i<=m;i++){
        r1=p1*b[i-n]%MOD1;
        r2=p2*b[i-n]%MOD2;
        hb1-=r1;
        if(hb1<0)
            hb1+=MOD1;
        hb2-=r2;
        if(hb2<0)
            hb2+=MOD2;
        hb1=(hb1*p+b[i])%MOD1;
        hb2=(hb2*p+b[i])%MOD2;
        if(ha1==hb1&&ha2==hb2){
            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;
}