#include <bits/stdc++.h>
using namespace std;
template <typename Arg1>
void __f(const char* name, Arg1&& arg1) {
  cout << name << " : " << arg1 << '\n';
}
template <typename Arg1, typename... Args>
void __f(const char* names, Arg1&& arg1, Args&&... args) {
  const char* comma = strchr(names + 1, ',');
  cout.write(names, comma - names) << " : " << arg1 << " | ";
  __f(comma + 1, args...);
}
int inf = 0x3f3f3f3f;
long long infl = 0x3f3f3f3f3f3f3f3fLL;
long double infd = 1.0 / 0.0;
const long long MOD = 1e9 + 7;
const long double pi = 2 * acos(0.0);
int main() {
  ios::sync_with_stdio(0);
  cin.tie(0);
  ;
  int n;
  cin >> n;
  vector<vector<int>> a(n, vector<int>(n));
  for (int i = 0; i < n; i++)
    for (int j = 0; j < n; j++) cin >> a[i][j];
  vector<int> as;
  for (int i = 0; i < n; i++) {
    int f = 0;
    for (int j = 0; j < n; j++)
      if (a[i][j] == 1 || a[i][j] == 3) f = 1;
    for (int j = 0; j < n; j++)
      if (a[j][i] == 2 || a[j][i] == 3) f = 1;
    if (f == 0) as.push_back(i + 1);
  }
  cout << (int)as.size() << '\n';
  for (int i = 0; i < (int)as.size(); i++) cout << as[i] << ' ';
  return 0;
}
