#include <bits/stdc++.h>
using namespace std;
template <typename T>
std::ostream &operator<<(std::ostream &out, vector<T> &v) {
  for (typename vector<T>::size_type i = 0; i < v.size(); ++i)
    out << v[i] << " ";
  out << "\n";
  return out;
}
template <typename T>
std::ostream &operator<<(std::ostream &out, set<T> &s) {
  for (auto e : s) out << e << " ";
  out << "\n";
  return out;
}
template <typename T, typename N>
std::ostream &operator<<(std::ostream &out, vector<pair<T, N> > &v) {
  for (size_t i = 0; i < v.size(); ++i)
    out << "(" << v[i].first << ", " << v[i].second << ") ";
  out << "\n";
  return out;
}
template <typename T>
std::ostream &operator<<(std::ostream &out, vector<vector<T> > &v) {
  for (size_t i = 0; i < v.size(); ++i) {
    for (size_t j = 0; j < v[i].size(); ++j) {
      out << v[i][j] << " ";
    }
    out << "\n";
  }
  return out;
}
template <typename T>
std::ostream &operator<<(std::ostream &out, vector<set<T> > &v) {
  for (size_t i = 0; i < v.size(); ++i) {
    out << v[i];
  }
  out << "\n";
  return out;
}
void solve() {
  int h;
  cin >> h;
  vector<int> a(h + 1);
  bool perfect = true;
  for (int i = 0; i <= h; ++i) {
    cin >> a[i];
    if (i > 0 && a[i] != 1 && a[i - 1] != 1) {
      perfect = false;
    }
  }
  if (perfect) {
    cout << "perfect\n";
    return;
  }
  cout << "ambiguous\n0 ";
  int last_prev_vertex = 1;
  int curr = 1;
  for (int i = 1; i <= h; ++i) {
    for (int j = 1; j <= a[i]; ++j) {
      cout << last_prev_vertex << " ";
      ++curr;
    }
    last_prev_vertex = curr;
  }
  cout << "\n";
  cout << "0 ";
  last_prev_vertex = 1;
  curr = 1;
  for (int i = 1; i <= h; ++i) {
    if (a[i] != 1 && a[i - 1] != 1) {
      cout << last_prev_vertex - 1 << " ";
      ++curr;
      for (int j = 2; j <= a[i]; ++j) {
        cout << last_prev_vertex << " ";
        ++curr;
      }
      last_prev_vertex = curr;
      continue;
    }
    for (int j = 1; j <= a[i]; ++j) {
      cout << last_prev_vertex << " ";
      ++curr;
    }
    last_prev_vertex = curr;
  }
  cout << "\n";
  return;
}
int main() {
  std::ios::sync_with_stdio(false);
  cin.tie(0);
  cout.tie(0);
  solve();
  return 0;
}
