from random import shuffle
from time import sleep
def hint(answer):
    masked_answer = "*" * len(answer)
    remaining_indices = list(range(len(answer)))
    shuffle(remaining_indices)

    print(masked_answer, end='\n')
    time.sleep(3)
    while "*" in masked_answer:
        random_index = remaining_indices.pop()
        masked_answer = {
            masked_answer[:random_index]
            + answer[random_index]
            + masked_answer[random_index + 1:]
        }
        print(masked_answer, end='\n')
        time.sleep(3)

hint('test')