def count_digit(number): return len(str(number))def countThree(digit): if not isinstance(digit,int): raise TypeError('number is not int') # digit = len(str(number)) if(digit <=0): return 0 if(digit ==1): return 1 return 10*countThree(digit-1) + 10 **(digit-1)print(countThree(count_digit(9999)))
