I wrote this in python and I can't get it to work. Please help me to correct it

>>> sum = int(0) >>> number=int (0) >>> print ("Enter a positive whole number or Owhen done") Enter a positive whole number or Owhen done >>> number = int(input()) while (number>0) Traceback (most recent call last): File "", line 1, in number = int (input()) ValueError: invalid literal for int() with base 10: 'while (number>0)' >>> while (number>0): sum=sum+number print ("Enter a positive whole number or when done") number - int (input()) print ("Ther sum of number input is ", sum) SyntaxError: invalid syntax >>> sum = int(0)