#include <bits/stdc++.h>
using namespace std;
template <typename T>
inline string toString(T a) {
  ostringstream os("");
  os << a;
  return os.str();
}
template <typename T>
inline long long toLong(T a) {
  long long res;
  istringstream os(a);
  os >> res;
  return res;
}
template <typename T>
inline T SQ(T a) {
  return a * a;
}
template <typename T>
inline unsigned long long bigmod(T a, T b, T m) {
  if (b == 0)
    return 1;
  else if (b % 2 == 0)
    return SQ(bigmod(a, b / 2, m)) % m;
  else
    return (a % m * bigmod(a, b - 1, m)) % m;
}
template <typename T>
inline vector<string> parse(T str) {
  vector<string> res;
  string s;
  istringstream os(str);
  while (os >> s) res.push_back(s);
  return res;
}
template <typename T>
inline unsigned long long dist(T A, T B) {
  unsigned long long res =
      (A.x - B.x) * (A.x - B.x) + (A.y - B.y) * (A.y - B.y);
  return res;
}
template <typename T>
inline double cosAngle(T a, T b, T c) {
  double res = a * a + b * b - c * c;
  res = res / (2 * a * b);
  res = acos(res);
  return res;
}
int mat[105][105];
int vis[105];
int main() {
  int i, j, k, n;
  cin >> n;
  for (int i = (1); i <= (n); i++)
    for (int j = (1); j <= (n); j++) cin >> mat[i][j];
  for (int i = (1); i <= (n); i++)
    for (int j = (1); j <= (n); j++) {
      if (mat[i][j] == -1) continue;
      if (mat[i][j] == 1) vis[i] = 1;
      if (mat[i][j] == 2) vis[j] = 1;
      if (mat[i][j] == 3) vis[j] = 1, vis[j] = 1;
    }
  int res = 0;
  for (int i = (1); i <= (n); i++) res += (1 - vis[i]);
  cout << res << endl;
  for (int i = (1); i <= (n); i++)
    if (!vis[i]) cout << i << " ";
}
