#include <fstream>
#include <algorithm>
using namespace std;
ifstream cin("strmatch.in");
ofstream cout("strmatch.out");
int phi[2000001];
vector <int> sol;
int main()
{
    int n,m,i;
    string s,b;
    cin >> s >> b;    int cv = s.size();

    s += "#";
    s += b;
    n = s.size();
    for(i = 1;i < n;i++){
        int j = phi[i-1];
        while(s[i] != s[j] && j > 0){
            j = phi[j - 1];
        }
        if(s[i] == s[j]){
            j++;
        }
        phi[i] = j;
        if(phi[i] == cv){
            sol.push_back(i - 2 * cv);
        }
    }
    cout << sol.size() << "\n";
    for(auto x : sol)
        cout << x << " ";
    return 0;
}