#!/usr/bin/env python
# coding: utf-8

# In[1]:


import random

true_value = random.randint(0, 100)

while True:
    guess = input('Enter your guess: ')

    try:
        guess = int(guess)

        if guess == true_value:
            print('Congratulations! You guessed correctly.')
            break
        elif guess > true_value:
            print('Lower.')  # user guessed too high
        else:
            print('Higher.')  # user guessed too low

    # when the input is invalid
    except ValueError:
        print('Please enter a valid number.')


# In[ ]: