#include<fstream>
#include<cstring>
using namespace std;
ifstream fin("strmatch.in");
ofstream fout("strmatch.out");
char a[2000002],b[2000002];
int B,p1,p2,na,nb,ha1,ha2,x[1002],c,i,r1,r2,hb1,hb2,d;
int main()
{
    fin>>a>>b;
    B=97;
    p1=99991;
    p2=88427;
    na=strlen(a);
    nb=strlen(b);
    ha1=0;
    ha2=0;
    for(i=0;i<=na-1;i++)
    {
        ha1=(ha1*B+a[i])%p1;
        ha2=(ha2*B+a[i])%p2;
    }
    r1=1;
    r2=1;
    for(i=1;i<=na-1;i++)
    {
        r1=(r1*B)%p1;
        r2=(r2*B)%p2;
    }
    hb1=0;
    hb2=0;
    for(i=0;i<=na-1;i++)
    {
        hb1=(hb1*B+b[i])%p1;
        hb2=(hb2*B+b[i])%p2;
    }
    c=0;
    if(ha1==hb1&&ha2==hb2)
    {
        c++;
        x[c]=0;
    }
    for(i=na;i<=nb-1;i++)
    {
        hb1=(hb1-(b[i-na]*r1)%p1+p1)%p1;
        hb1=(hb1*B+b[i])%p1;

        hb2=(hb2-(b[i-na]*r2)%p2+p2)%p2;
        hb2=(hb2*B+b[i])%p2;

        if(ha1==hb1&&ha2==hb2)
        {
            c++;
            if(c<=1000)
            {
                x[c]=i-na+1;
            }
        }
    }
    fout<<c<<endl;
    d=c;
    if(d>1000)
    {
        d=1000;
    }
    for(i=1;i<=d;i++)
    {
        fout<<x[i]<<" ";
    }
    fin.close();
    fout.close();
    return 0;
}