import random

hedges = ("Please tell me more.",
          "Many of my patients tell me the same thing. ",
          "Please continue.")

qualifiers = ("Why do you say that? ",
              "You seem to think that ",
              "Can you explain why? ")

replcements = {"I": "you", "me": "you", "my": "your",
               "we": "you", "us": "you", "mine": "yours"}


def reply(sentence):
    """Builds and returns a reply to the sentence."""
    probability = random.randint(1, 4)
    if probability == 1:
        return random.choice(hedges)
    else:
        return random.choice(qualifiers) + changePerson(sentence)


def changePerson(sentence):
    """Replaces first person pronouns with second person                   pronouns."""

    words = sentence.split()
    replyWords = []
    for word in words:
        replyWords.append(replcements.get(word, word))
    return " ".join(replyWords)


def main():
    """Handles the interaction between patient and doctor."""
    print("Good morning, I hope you are well today.")
    print("What can I do for you?")
    inputs = {}
    while True:
        sentence = input("\n>> ")
        if sentence.lower() in inputs.keys():
            inputs[sentence.lower()] += 1
        else:
            inputs[sentence.lower()] = 1
        if inputs[sentence.lower()] > 2:
            print("Your question is already answered")
        if sentence.upper() == "QUIT":
            print("Have a nice day!")
            break
        print(reply(sentence))


# The entry point for program execution
if __name__ == "__main__":
    main()