def usernameAndPasswordInput ():
        username = input ("Enter your username: ")
        password = input ("Enter your password: ")
        print ()
        for elmt in masterlist:
            if elmt [0]==username:
                if elmt [1]==password:
                    return masterlist
                    return True
            else:
                print ("Your username or password is incorrect.")
                print ()
                return False

def main() :
    startMessage ()
    getData ("facepalm")
    LoginResponse = False
    while LoginResponse == False:
        Startresponse = startOptions ()
        if Startresponse == "1":
            LoginResponse = usernameAndPasswordInput ()
        elif Startresponse == "2" :
            quitMessage ()
            return

    #LoginResponse
    if LoginResponse == True:
        HomePageResponse = homePageOptions ()
        #HomePageResponse
        if HomePageResponse == "1":
            viewProfile ()
        elif HomePageResponse == "2":
            viewMessages ()
        elif HomePageResponse == "3":
            Message = leaveMessage ()
        elif HomePageResponse == "4":
            Startresponse = startOptions ()

main ()