#include <bits/extc++.h>

int main() {
    using namespace std;
    unsigned long N;
    cin >> N;
    vector<unsigned long> A{1};
    const auto query{[](auto i, auto j){
        cout << "? " << i << " " << j << endl;
        unsigned long t;
        cin >> t;
        return t;
    }};
    for(unsigned long i{2}; i <= N; ++i){
        if(query(A.back(), i))A.emplace_back(i);
        else if(query(i, A[0]))A.insert(begin(A), i);
        else{
            unsigned long l{0}, r{size(A)};
            while(l + 1 < r){
                auto m{(l + r) / 2};
                (query(A[m], i) ? l : r) = m;
            }
            A.insert(begin(A) + r, i);
        }
    }
    cout << "!" << endl;
    cout << N - 1 << endl;
    for(const auto a : A)cout << a << " ";
    cout << endl;
    return 0;
}