text: print("*" * 60)
  print("Hello student! ")
  print("Enter your maths and science marks to find the average")
  print("*" * 60)
  
  answer = True
  while answer:
  
      UserMaths = input("Maths marks: ")
      UserScience = input("Science marks: ")
      try:
          maths = int(UserMaths)
          if maths > 100:
              print("Enter valid Maths marks")
              print("*" * 40)
          else:
              science = int(UserScience)
              if science > 100:
                  print("Enter valid Science marks")
                  print("*" * 40)
              else:
                  average = (maths + science) / 2
                  averageString = str(average)
  
                  if average >= 75:
                      print("Your total is: ", (maths + science))
                      print("Your average is: " + averageString)
                      print("Your grade is 'A' ")
                      answer = None
                      print("*" * 60)
                  if 75 > average >= 65:
                      print("Your total is: ", (maths + science))
                      print("Your average is: " + averageString)
                      print("Your grade is 'B' ")
                      answer = None
                      print("*" * 60)
                  if 65 > average >= 55:
                      print("Your total is: ", (maths + science))
                      print("Your average is: " + averageString)
                      print("Your grade is 'C' ")
                      answer = None
                      print("*" * 60)
                  if 55 > average >= 30:
                      print("Your total is: ", (maths + science))
                      print("Your average is: " + averageString)
                      print("Your grade is 'D' ")
                      answer = None
                      print("*" * 60)
                  if average < 30:
                      print("Your total is: ", (maths + science))
                      print("Your average is: " + averageString)
                      print("Your grade is 'F' ")
                      answer = None
                      print("*" * 60)
      except ValueError:
          print("Oops.. Enter numbers not letters or characters")
          print("*" * 60)
  