def listen(): #Definition of listen() function.
    wait = 0
    print ("Listening!")
    for word in speech:
        word_string = str(word)
        if (word_string == "START"): #Listens for the word "Start."
            print("Primary Function Executed.")
        if (word_string == "REST"): #Listens for the word "Rest."
            print ("In loop")
            wait = 1
            while (wait == 1): #Safety loop.
                for cap in speech:
                    cap_string = str(cap)
                    if (cap_string == "OKAY"):
                        listen()