#include <bits/stdc++.h>
#define maxN 4000050
#define minim(a, b) ((a < b) ? a : b)
using namespace std;
string S1,S2;
int Pi[maxN];
int Answer[maxN];
int i,A,B,sol,k(0);
int main()
{
 ifstream cin("strmatch.in");
 ofstream cout("strmatch.out");
 getline(cin,S1);
 getline(cin,S2);
 A=S1.size(); 
 S1+='#'+S2; 
 Pi[0]=0;
 for (i=1;i<S1.size();++i)
     {
     while (k>0 && S1[i]!=S1[k]) k=Pi[k-1]; 
     if (S1[i]==S1[k]) ++k; Pi[i]=k;
	 }
 for (i=A+1;i<=S1.size()-1;++i)
   if (Pi[i]==A)Answer[++sol]=i-2*A;
 cout<<sol<<"\n"; 
 for (i=1;i<=min(sol,1000);++i)cout<<Answer[i]<<" ";
 return 0;}