import java.io.*;

class UseIntSets2
{
// Set maintenance program with methods in same class

 public static void main(String[] args)
 throws IOException
 {
  final int MAX = 100;
  int[] array = new int[MAX];
  int n=0,count=0;
  char ch;
  String line;
  BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
  do {
      System.out.print(": ");
      line = in.readLine();
      ch = line.charAt(0);
      if(line.length()>1)
         n = Integer.parseInt(line.substring(1).trim());
      switch(ch)
         {
          case 'q' : 
            break;
          case 'd' :
            count = delete(n,array,count);
            break;
          case 'a' :
            count = add(n,array,count);
            break;
          case 'm' :
            if(member(n,array,count))
               System.out.println("Is a member");
            else
               System.out.println("Not a member");
            break;
          case 'p':
            print(array,count);
            break;
          default:
            System.out.print("d - delete, a - add, m - member,");
            System.out.println(" p - print, q - quit");
            break;
         }
     }
  while(ch!='q');
 }

 public static int delete(int n,int[] array,int count)
 {
  int i;
  for(i=0; i<count&&array[i]!=n; i++) {}
  if(i<count)
     {
      array[i]=array[count-1];
      return count-1;
     }
  return count;
 }

 public static int add(int n,int[] array,int count)
 {
  int i;
  for(i=0; i<count&&array[i]!=n; i++) {}
  if(i==count)
     {
      array[count] = n;
      return count+1;
     }
  return count;
 }

 public static boolean member(int n,int[] array,int count)
 {
  int i;
  for(i=0; i<count&&array[i]!=n; i++) {}
  return i<count;
 }
 
 public static void print(int[] array,int count)
 {
  int i;
  System.out.print("{");
  if(count>0)
     {
      System.out.print(array[0]);
      for(i=1;i<count;i++)
         System.out.print(","+array[i]);
     }
  System.out.println("}");
 }
}