def is_armstrong(n:int) -> bool:
    digits_str = str(n)
    digits_len = len(digits_str)
    total = 0
    for digit in digits_str:
        number = int(digit)
        result = number ** digits_len
        total = total + result
    return total == n
if __name__ == "__main__":
    print(f"is_armstrong(153) = {is_armstrong(153)}")
    print(f"is_armstrong(10) = {is_armstrong(10)}")
    print(f"is_armstrong(9474) = {is_armstrong(9474)}")
    print(f"is_armstrong(123) = {is_armstrong(123)}")