import threading, random, random, math, time

# Create function to take an answer string, mask it,-- choose random index of the mask, if its still masked, replace with actual character in same index of answer
# every three seconds --until masked string is void of mask characters(*)

def hint():
    masked_answer = ""
    answer = "thisisstring"
    answer_length = []
    for x in range(len(answer)-1):
        answer_length.append(x)

    for x in answer_length:
        masked_answer = masked_answer + "*"

    while masked_answer.count("*") > 0:
        print(masked_answer+"\n")

        rnd_index = random.choice(answer_length)

        type(rnd_index)
        if masked_answer[rnd_index] in answer_length:

            if masked_answer.index(rnd_index) == answer.index(rnd_index):
                time.sleep
                break

            else:
                masked_answer.replace(masked_answer[rnd_index], answer[rnd_index])
                time.sleep(3)
        answer_length.remove(rnd_index)
        print(masked_answer)


hint()