import random

answer = random.randrange(21)  # generates any random number from 0-20


userinput = int(input('Guess a number from 0 to 20: ').strip())


def verifyinput(value):
    if value == answer:
        print('Answer correct, you win!')
        correct = True
    elif value > answer:
        print('Too high, try again!')
    elif value < answer:
        print('Too low, try again!')


verifyinput(userinput)