#include <bits/extc++.h>

int main() {
    using namespace std;
    unsigned long N;
    cin >> N;
    vector<unsigned long> A(N);
    iota(begin(A), end(A), 1);
    stable_sort(begin(A), end(A), [](auto i, auto j){
        cout << "? " << i << " " << j << endl;
        unsigned long x;
        cin >> x;
        return x;
    });
    cout << "!" << endl;
    cout << N - 1 << endl;
    for(const auto a : A)cout << a << " ";
    cout << endl;
    return 0;
}