#include <fstream>
#include <cstring>
using namespace std;
ifstream cin("strmatch.in");
ofstream cout("strmatch.out");
char s[4000005];
int kmp[4000005];
int main()
{
    int n,m,i,nr=0,x,afis=0;
    cin>>s+1;
    n=strlen(s+1);
    s[n+1]='?';///oh yee
    cin>>s+n+2;
    m=strlen(s+1);
    for(i=2;i<=m;i++)
    {
      x=kmp[i-1];
      while(s[i]!=s[x+1] && x>0)
        x=kmp[x];
      if(s[i]==s[x+1])
        kmp[i]=x+1;
      if(i>=n+2 && kmp[i]==n)
        nr++;
    }
    cout<<nr<<'\n';
    for(i=n+2;i<=m && afis<1000;i++)
      if(kmp[i]==n)
        cout<<i-n-1-n<<" ";
    return 0;
}