import java.io.*;

class UseIntSets1
{
// Simplistic "single method" set maintenance program

 public static void main(String[] args)
 throws IOException
 {
  final int MAX = 100;
  int[] array = new int[MAX];
  int i,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' :
            for(i=0; i<count&&array[i]!=n; i++) {}
            if(i<count)
               {
		count--;
                array[i]=array[count];
               }
            break;
          case 'a' :
            for(i=0; i<count&&array[i]!=n; i++) {}
            if(i==count)
	       {
                array[count] = n;
	        count++;
	       }
            break;
          case 'm' :
            for(i=0; i<count&&array[i]!=n; i++) {}
            if(i==count)
               System.out.println("Not a member");
            else
               System.out.println("Is a member");
            break;
          case 'p':
            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("}");
            break;
          default:
            System.out.print("d - delete, a - add, m - member,");
            System.out.println(" p - print, q - quit");
            break;
         }
     }
  while(ch!='q');
 }
}