#include #define rep(i,a,b) for(int i=a;i=b;i--) #define fore(i,a) for(auto &i:a) #define all(x) (x).begin(),(x).end() //#pragma GCC optimize ("-O3") using namespace std; void _main(); int main() { cin.tie(0); ios::sync_with_stdio(false); _main(); } typedef long long ll; const int inf = INT_MAX / 2; const ll infl = 1LL << 60; templatebool chmax(T& a, const T& b) { if (a < b) { a = b; return 1; } return 0; } templatebool chmin(T& a, const T& b) { if (b < a) { a = b; return 1; } return 0; } //--------------------------------------------------------------------------------------------------- /*---------------------------------------------------------------------------------------------------             ∧_∧       ∧_∧  (´<_` )  Welcome to My Coding Space!      ( ´_ゝ`) /  ⌒i @hamayanhamayan     /   \    | |     /   / ̄ ̄ ̄ ̄/  |   __(__ニつ/  _/ .| .|____      \/____/ (u ⊃ ---------------------------------------------------------------------------------------------------*/ int N; //--------------------------------------------------------------------------------------------------- int ask(int without) { int M = N - 1; vector v; rep(i, 1, N + 1) if (i != without) v.push_back(i); printf("? %d\n", M); rep(i, 0, M) { if (i) printf(" "); printf("%d", v[i]); } printf("\n"); fflush(stdout); int ans; cin >> ans; return ans; } void answer(vector ans) { int K = ans.size(); printf("! %d\n", K); rep(i, 0, K) { if (i) printf(" "); printf("%d", ans[i]); } printf("\n"); fflush(stdout); } //--------------------------------------------------------------------------------------------------- void _main() { cin >> N; vector ans; rep(i, 1, N + 1) { auto res = ask(i); if (res == 0) ans.push_back(i); } answer(ans); }