package set.example.pkg1;

import java.util.ArrayList;
import java.util.Collections;
import java.util.HashSet;
import java.util.List;
import java.util.Scanner;
import java.util.Set;

class GfG
{
    /*inserts an element x to the set s */
    void insert(Set<Integer> s, int x)
    {
	// Your code here
	    s.add(x);
    }
	
    /*prints the contents of the set s in ascending order */
    void print_contents(Set<Integer> s)
    {
	// Your code here
	    List<Integer> list = new ArrayList<Integer>(s);
	    Collections.sort(list);
	    for(Integer i : list){
	        System.out.print(i + " ");
	    }
    }
	
    /*erases an element x from the set s */	
    void erase(Set<Integer> s, int x)
    {
	// Your code here
	    s.remove(x);
    }
	
    /*returns the size of the set s */
    int size(Set<Integer> s)
    {
        // Your code here
        return s.size();
    }
		
    /*returns 1 if the element x is
    present in set s else returns -1 */
    int find(Set<Integer> s, int x)
    {
	// Your code here	
	    if(s.contains(x)) {
	        return 1;
	    }
	    else {
	        return -1;
	    }
    }
}

public class SetExample1 {
    
    public static void main(String[] args) {
        // TODO code application logic here
        Scanner sc = new Scanner(System.in);
		int t = sc.nextInt();
		while(t>0)
		{
			Set<Integer> s = new HashSet<Integer>() ;
			int q = sc.nextInt();
			
			while(q>0)
			{
				GfG g = new GfG();
				char c = sc.next().charAt(0);
				if(c == 'a')
				{
					int x = sc.nextInt();
					g.insert(s,x);
				}
				if(c =='b')
				{
					g.print_contents(s);
				}
				if(c == 'c')
				{
					int x = sc.nextInt();
					g.erase(s,x);
				}
				if(c == 'd')
				{
					int x = sc.nextInt();
					System.out.print(g.find(s,x)+" ");
				}
				if(c == 'e')
				System.out.print(g.size(s)+" ");
			q--;
			//System.out.println();
			}
		t--;
		System.out.println();
		}
    }
    
}