import random

def choose_word():
    words = ["python", "hangman", "challenge", "programming", "developer", "petersneal","piano","combine","liver","fireplace","muggy","loop","pyton","lossantos","night", "aeiou","python", "hangman", "challenge", "programming", "developer", "petersneal","piano","combine","liver","fireplace","muggy","loop","pyton","losSantos","night","skibidi","day","sun","people","sunshine","blood","walking","dead","saint","sinner","retribution"]
    return random.choice(words)

def display_word(word, guessed_letters):
    display = ""
    for letter in word:
        if letter in guessed_letters:
            display += letter
        else:
            display += "_"
    return display

def hangman():
    word = choose_word()
    guessed_letters = []
    attempts = 10

    print("Welcome to Hangman!")
    print("Try to guess the word.")

    while attempts > 0:
        print("\nWord:", display_word(word, guessed_letters))
        print(f"You have {attempts} attempts left.")
        
        guess = input("Guess a letter: ").lower()
        
        if len(guess) != 1 or not guess.isalpha():
            print("Please enter a valid single letter.")
            continue
        
        if guess in guessed_letters:
            print("You've already guessed that letter.")
            continue
        
        guessed_letters.append(guess)
        
        if guess not in word:
            attempts -= 1
            print(f"Wrong guess! The letter {guess} is not in the word.")
        
        if set(word) <= set(guessed_letters):
            print(f"Congratulations! You've guessed the word: {word}")
            break

    if attempts == 0:
        print(f"Sorry, you've lost! The word was: {word}")

if __name__ == "__main__":
    hangman()