#include <bits/stdc++.h>
using namespace std;
void fast() {
  std::ios_base::sync_with_stdio(0);
  cin.tie(NULL);
  cout.tie(NULL);
}
void file() {}
int main() {
  fast();
  file();
  int n, idx = 0;
  cin >> n;
  vector<vector<int>> v(n, vector<int>(n));
  vector<bool> ans(n, 1);
  for (int i = 0; i < n; i++) {
    for (int j = 0; j < n; j++) {
      cin >> v[i][j];
      if (v[i][j] == 3) {
        ans[i] = 0;
        ans[j] = 0;
      } else if (v[i][j] == 1)
        ans[i] = 0;
      else if (v[i][j] == 2)
        ans[j] = 0;
    }
  }
  int cnt = 0;
  for (int i = 0; i < n; i++) {
    if (ans[i]) cnt++;
  }
  cout << cnt << endl;
  for (int i = 0; i < n; i++) {
    if (ans[i]) cout << i + 1 << " ";
  }
  return 0;
}
