#include <fstream>
#include <string>
#include <iostream>
  
using namespace std;
  
ifstream fi("strmatch.in");
ofstream fo("strmatch.out");
  
string a,b;
int p1,h,k,n,m,i,v[3000000],vn;
const int mod=100021,p=37;
  
  
int main(){
      
    fi >> a >> b; n = a.size(); m = b.size();
    if (n>m) { fo << "0"; return 0; }
     
    p1=1;  
    for (i=0; i<n; i++){
        k = (k*p+a[i]) % mod;
        h = (h*p+b[i]) % mod; 
        if (i) p1 = (p1*p) % mod;
    }
 
    if ((k==h)&&(b.substr(0,n)==a)) vn++;
      
    for (i=n; i<m; i++){
        h = ((h-(b[i-n]*p1)%mod+mod)*p+b[i])%mod;
        if ((k==h)&&(b.substr(i-n+1,n)==a)) v[vn++] = i-n+1;
    }
      
    fo << vn << "\n";
    for (i=0; i<vn && i<1000; i++) fo << v[i] << " ";
      
    return 0;
}