Get string length

[RedSkeleton007]

I need to convert user string input to a number. My statement on line 7 isn't working:

import itertools
import sys
 
alphaNum = 'abc'
password = 'cab'
guessLength = input("How many characters would you like to guess up to: ")
int(guessLength)

 
for x in range(0, guessLength+1):
    guessList = [''.join(i) for i in itertools.product(alphaNum, repeat = x)]
    for guess in guessList:
        if (password == guess):
            print("the password is " + password)
            sys.exit()
        print(guess)

Error:
Traceback (most recent call last):
  File "E:/Python/Python36-32/SamsPrograms/FinalPasswordGuesser.py", line 10, in <module>
    for x in range(0, guessLength+1):
TypeError: Can't convert 'int' object to str implicitly

What do I need to do?