#include <bits/stdc++.h>

int main() {
  int N;
  std::cin >> N;
  auto comp = [](int i, int j) {
    if (i == j) {
      return false;
    }
    std::cout << "? " << i << " " << j << "\n";
    int T;
    std::cin >> T;
    return T == 1;
  };

  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];
  }
}