#include <bits/stdc++.h>

int main() {
  int N;
  std::cin >> N;
  std::map<std::pair<int, int>, bool> memo;
  auto comp = [&](int i, int j) {
    if (i == j) {
      return false;
    }
    if (!memo.count({i, j})) {
      std::cout << "? " << i << " " << j << "\n";
      int T;
      std::cin >> T;
      memo[{i, j}] = T;
      memo[{j, i}] = !T;
    }
    return memo[{i, j}];
  };

  std::vector<int> v(N);
  std::iota(v.begin(), v.end(), 1);
  std::stable_sort(v.begin(), v.end(), comp);
  std::cout << "!\n" << N - 1 << "\n";
  for (int i = 0; i < N; i++) {
    std::cout << v[i] << " \n"[i + 1 == N];
  }
}