请教：Python入门-Number Guessing Game 错误

以下是引用dan2019在2019-11-20 10:00:04的发言：

刚刚开始入门Python，照着书录入，是一个Number Guessing Game，但还是遇到了错误。书里的程序是Python2.7.3下运行的，我是在Python3.7.3运行的，不知道有没有关系。以下是我按照书本录入的code：
import random
secret = random.randint(1,99)
guess = 0
tries = 0
print ("AHOY! I'm the Dread Pirate Roberts, and I have a secret!")
print ("It is a number from 1 to 99. I'll give you 6 tries.")
while guess != secret and tries < 6:
    guess = input ("what's your guess?")
    if guess < secret:
        print ("Too low, ye scurvy dog!")
    elif guess > secret:
        print ("Too high, landlubber!")

    tries = tries + 1

if guess == secret:
    print ("Avast! Ye got it! Found my secret, ye did!")
else:
    print ("No more questions! Better luck next time, matey!")
    print ("The secret number was, secret")

运行之后，有一个错误提示：
Traceback (most recent call last):
  File "D:/Python/Python Practice/Number-guessing Game.py", line 9, in <module>
    if guess < secret:
TypeError: '<' not supported between instances of 'str' and 'int'

请教各位：该怎样修改code？非常感谢！