// Please enter you student number
//  in this comment here:

class Main
{
  public static void main( String args[] )
  {
    boolean process = false;
    while ( process )
    {
      System.out.print("#Enter size of box [<0 to exit]: ");
      int sq   = BIOX.getInt();
      if ( sq < 0 )
        process = false;
      else if ( sq%2 == 0 )
        System.out.println( "Size must be odd: try again" );
      else
        printBox( sq );
    }

  }

  private static void printBox( int size )
  {
    for ( int row=1; row<=size; row++ )
    {
      for ( int col=1; col<=size; col++ )
      {
        if ( row == 1 || row == size )
        {
          System.out.print("*");
        } else {
          if ( col == 1 && col == size )
          {
            System.out.print( "*" );
          } else {
            if ( col%2 == 0 )
               System.out.print( " " );
            else
               System.out.print( "+" );
          }
        }
      }
      System.out.println();
    }
  }

}