input: def is_armstrong_number(num: int) -> bool:
      """
      Check if a given number is an Armstrong number.
  
      >>> is_armstrong_number(153)
      True
      >>> is_armstrong_number(9474)
      True
      >>> is_armstrong_number(123)
      False
      """
      n = len(str(num))
      temp = num
      sum_of_digits = 0
  
      while temp > 0:
          digit = temp % 10
          sum_of_digits += digit ** n
          temp //= 10
  
      if num == sum_of_digits:
          return True
      else:
          return False
output:     n = len(str(num))
      temp = num
      sum_of_digits = 0
  
      while temp > 0:
          digit = temp % 10
          sum_of_digits += digit ** n
          temp //= 10
  
      if num == sum_of_digits:
          return True
      else:
          return False