#include<fstream>
#include<string>

using namespace std;
const int maxn = 2000000;
string s, t;
int urmator[maxn];

main(){
	ifstream fin("strmatch.in");
	ofstream fout("strmatch.out");
	
	fin>>t>>s;
	int k = 0;
	
int i, j, m = strlen(s); 
   urmator[0] = -1; 
   for(i = 0, j = -1; i < m; i++, j++, urmator[i] = j) 
    while(j >= 0 && s[i] != s[j]) 
        j = urmator[j];
        
        
        


	fout<<k<<"\n";
	if(k>1001)k=1001;
	for(int j=0;j<k;j++)fout<<a[j]<<" ";
	
	
}