import java.util.*;

public class Main {
	public static void main (String[] args) {
		Scanner sc = new Scanner(System.in);
		int n = sc.nextInt();
		ArrayList<Integer> list = new ArrayList<>();
		for (int i = 1; i <= n; i++) {
		    list.add(i);
		}
		int idx = 0;
		while (idx < list.size()) {
		    output(list, idx);
		    int result = sc.nextInt();
		    if (result == 0) {
		        list.remove(idx);
		    } else {
		        idx++;
		    }
		}
		System.out.println("! " + list.size());
		StringBuilder sb = new StringBuilder();
		for (int i = 0; i < list.size(); i++) {
		    if (i > 0) {
		        sb.append(" ");
		    }
		    sb.append(list.get(i));
		}
		System.out.println(sb);
		System.out.flush();
	}
	
	static void output(ArrayList<Integer> list, int without) {
	    StringBuilder sb = new StringBuilder();
	    sb.append("? ").append(list.size()).append("\n");
	    for (int i = 0; i < list.size(); i++) {
	        if (i > 0) {
	            sb.append(" ");
	        }
	        sb.append(list.get(i));
	    }
	    System.out.println(sb);
	    System.out.flush();
	}
}