// May this submission get accepted!

#pragma GCC optimize ("O3")
#pragma GCC target ("tune=native")
#pragma GCC target ("avx")

#include <bits/stdc++.h>

// 汎用マクロ
#define ALL_OF(x) (x).begin(), (x).end()
#define REP(i,n) for (long long i=0, i##_len=(n); i<i##_len; i++)
#define RANGE(i,is,ie) for (long long i=(is), i##_end=(ie); i<=i##_end; i++)
#define DSRNG(i,is,ie) for (long long i=(is), i##_end=(ie); i>=i##_end; i--)
#define STEP(i, is, ie, step) for (long long i=(is), i##_end=(ie), i##_step = (step); i<=i##_end; i+=i##_step)
#define UNIQUE(v) do { sort((v).begin(), (v).end()); (v).erase(unique((v).begin(), (v).end()), (v).end()); } while (false)
template<class T> bool chmax(T &a, const T &b) { if (a < b) {a = b; return true;} return false; }
template<class T> bool chmin(T &a, const T &b) { if (a > b) {a = b; return true;} return false; }
#define INF 0x7FFFFFFF
#define LINF 0x7FFFFFFFFFFFFFFFLL
#define Yes(q) ((q) ? "Yes" : "No")
#define YES(q) ((q) ? "YES" : "NO")
#define Possible(q) ((q) ? "Possible" : "Impossible")
#define POSSIBLE(q) ((q) ? "POSSIBLE" : "IMPOSSIBLE")
#define DUMP(q) cerr << "[DEBUG] " #q ": " << (q) << " at " __FILE__ ":" << __LINE__ << endl
#define DUMPALL(q) do { cerr << "[DEBUG] " #q ": ["; REP(DUMPALL_ITR, (q).size()) { cerr << (q)[DUMPALL_ITR] << (DUMPALL_ITR == DUMPALL_ITR_len-1 ? "" : ", "); } cerr << "] at " __FILE__ ":" << __LINE__ << endl; } while (false)
template<class T> T gcd(T a, T b) { if (a < b) std::swap(a, b); while (b) std::swap(a %= b, b); return a; }
template<class T> T lcm(const T a, const T b) { return a / gcd(a, b) * b; }

// gcc拡張マクロ
#define popcount __builtin_popcount
#define popcountll __builtin_popcountll

// エイリアス
#define DANCE_ long
#define ROBOT_ unsigned
#define HUMAN_ signed
using  ll = DANCE_ HUMAN_ DANCE_;
using ull = DANCE_ ROBOT_ DANCE_;
using  ld = long double;
using namespace std;

// モジュール
struct inp {
    size_t sz;
    inp(size_t _sz = 0): sz(_sz) {}
    template <typename T>
    operator T () const { T a; cin >> a; return a; }
    template <typename T>
    operator vector<T> () const {
        vector<T> a(sz);
        for (size_t i = 0; i < sz; i++) {
            cin >> a[i];
        }
        return a;
    }
};
template <typename T>
void say(T &a) {
    cout << a << endl;
}
template <typename T>
void say(vector<T> &a, char sep = ' ', char end = '\n') {
    char v[2] = {sep, end};
    for (size_t i = 0, l = a.size(); i < l; i++) {
        cout << a[i] << v[i==l-1];
    }
    cout << flush;
}

// 処理内容
int main() {
    
    ll n = inp();

    vector<bool> flg(n, true);

    REP(i, n) {
        vector<ll> q; q.reserve(n);
        REP(j, n) {
            if (j != i && flg[j]) {
                q.push_back(j+1);
            }
        }
        cout << "? " << q.size() << "\n";
        say(q);
        flg[i] = !(ll)inp();
    }

    cout << "! " << accumulate(ALL_OF(flg), 0LL) << "\n";
    vector<ll> ans; ans.reserve(n);
    REP(i, n) {
        if (flg[i]) {
            ans.push_back(i+1);
        }
    }
    say(ans);
    
}