import java.util.Scanner;
public class Loop
{
  public static void main( String [] args )
  {
	Scanner input=new Scanner(System.in);
	int i=0;
	String ReDo="y"; 

	while(ReDo.equalsIgnoreCase("y"))
	{
		System.out.println(i*i);
		i++;
		System.out.println("Do again? y/n");
		ReDo = input.next();
	}
  }
}