input: 
  def is_armstrong_number(num: int) -> bool:
      """
      Check if a given number is an Armstrong number.
      An Armstrong number (also known as a narcissistic number) is a number that is equal to the sum of its own digits each raised to the power of the number of digits.
      For example, 153 is an Armstrong number because 1^3 + 5^3 + 3^3 = 153.
      >>> 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
      
      return num == sum_of_digits
  
output:     n = len(str(num))
      temp = num
      sum_of_digits = 0
      
      while temp > 0:
          digit = temp % 10
          sum_of_digits += digit ** n
          temp //= 10
      
      return num == sum_of_digits