#include<iostream>
#include<fstream>
#include<string>
#define B1 130
#define B2 130
#define M1 1000000009
#define M2 1000000007
using namespace std;
fstream fin("strmatch.in",ios::in),fout("strmatch.out",ios::out);
string a,b;
long long p1=1,p2=1,k1,k2,k3,k4;
int poz[1111];
int main()
{
    int i,ante,j,n=0;
    fin>>a>>b;
    for(i=0;i<a.size();i++)
    {
        if(i>0) p1=(p1*B1)%M1;
        if(i>0) p2=(p2*B2)%M2;
        k1=(k1*B1+int(a[i]))%M1;
        k2=(k2*B2+int(a[i]))%M2;
    }
    for(i=0;i<a.size();i++)
    {
        k3=(k3*B1+int(b[i]))%M1;
        k4=(k4*B2+int(b[i]))%M2;
    }
    //cout<<k1<<" "<<k2<<"\n";
    if(k1==k3 && k2==k4)
    {
        n++;
        poz[n]=0;
    }
    for(i=a.size();i<b.size();i++)
    {
        ante=i-a.size();

        k3=k3-p1*int(b[ante]);
        k4=k4-p2*int(b[ante]);

        k3=(((k3%M1+M1)%M1)*B1+int(b[i]))%M1;
        k4=(((k4%M2+M2)%M2)*B2+int(b[i]))%M2;

        if(k1==k3 && k2==k4)
        {
            n++;
            if(n<1000) poz[n]=ante+1;
        }
    }
    fout<<n<<"\n";
    for(i=1;i<=min(1000,n);i++) fout<<poz[i]<<" ";
}