#include <fstream>
#include <cstring>
#define p 64
#define m1 100007
#define m2 100032
using namespace std;
ifstream fin("strmatch.in");
ofstream fout("strmatch.out");
char A[2000001],B[2000001],C[2000001];
int n,p1=1,p2=1,a1,b1,a2,b2,nr,na,nb,i;
int main()
{
    fin>>A;
    fin>>B;
    na=strlen(A);
    nb=strlen(B);
    for(i=0;i<na;i++)
    {
        a1=(a1*p+A[i])%m1;
        a2=(a2*p+A[i])%m2;
        b1=(b1*p+B[i])%m1;
        b2=(b2*p+B[i])%m2;
        if(i!=0)
        {
            p1=(p1*p)%m1;
            p2=(p2*p)%m2;
        }
    }
    if(a1==b1 && a2==b2)
    {
        C[0]=1;
        nr++;
    }
    for(i=na;i<nb;i++)
    {
        b1=((b1-(B[i-na]*p1)%m1+m1)*p+B[i])%m1;
        b2=((b2-(B[i-na]*p2)%m2+m2)*p+B[i])%m2;
        if(a1==b1 && a2==b2)
        {
            C[i-na+1]=1;
            nr++;
        }
    }
    fout<<nr<<'\n';
    for(i=0;i<=nb && i<=1000;i++)
        if(C[i]==1)
            fout<<i<<" ";
    return 0;
}