import random

def generate_code():
    """Generate a random three-digit code."""
    return str(random.randint(100, 999))

def check_guess(code, guess):
    """Check the guess against the code and return the result."""
    if code == guess:
        return "Congratulations! You cracked the code!"
    else:
        matching_digits = sum(1 for x, y in zip(code, guess) if x == y)
        return f"Wrong guess. {matching_digits} digit(s) are correct."

def main():
    print("Welcome to the Code-Cracking Game!")
    print("A three-digit code has been generated. Try to crack it!")
    
    secret_code = generate_code()
    
    while True:
        user_guess = input("Enter your guess (a three-digit number): ")
        
        if not user_guess.isdigit() or len(user_guess) != 3:
            print("Please enter a valid three-digit number.")
            continue
        
        result = check_guess(secret_code, user_guess)
        print(result)
        
        if result.startswith("Congratulations"):
            break

if __name__ == "__main__":
    main()