#include <bits/stdc++.h>   using namespace std;   int main() {     int n;     cin >> n;     bool good[n];     for (int i = 0; i < n; i++) good[i] = 1;     for (int i = 0; i < n; i++) {       int isGood = 1;       for (int j = 0; j < n; j++) {         int dum;         cin >> dum;         if (dum == 1 || dum == 3)           good[i] = 0;         else if (dum == 2)           good[j] = 0;       }     }     int ans = 0;     for (int i = 0; i < n; i++)       if (good[i]) ans++;     cout << ans << endl;     for (int i = 0; i < n; i++) {       if (good[i]) cout << i + 1 <<    ;     }     cout << endl;     return 0;   }   