#include <bits/stdc++.h>
using namespace std;
string s,s2;
long long i,j,n,k,sol(0);
long long pi[4000013];
vector <int> V;
#define minim(a, b) ((a < b) ? a : b)
void kmp()
{
 pi[0]=0;
 for (i=1;i<s.size();++i)
   {
    long long k=pi[i-1];
    while(s[i]!=s[k] && k>0) k=pi[k-1];
    if (s[i]==s[k]) ++k;
    pi[i]=k;
   }
}
  
int main(void)
{
 ifstream  cin("strmatch.in");
 ofstream cout("strmatch.out");
 getline(cin,s);
 getline(cin,s2);
 long long length=s.size();
 s+='#'+s2;
 kmp();
 for (i=length+1;i<s.size();++i)    
   if (pi[i]==length) 
     V.push_back(i-2*length);
 cout<<V.size()<<"\n";
 for (i=0;i<minim(V.size(),1000);++i)
    cout<<V[i]<<" ";    
 return 0;
}