print ("Welcome to de quiz")
name = input("What is your name?: ")
age = input ("what is your age?: ")
username = name[0:3] + age
print ("your username is  " + username)

users = {}
status = ""

def displayMenu():
    status = input("Are you registered user? y/n? Press q to quit")
    if status == "y":
        oldUser()
    elif status == "n":
        newUser()

def newUser():
    createLogin = input("Create login name (the username given above): ")

    if createLogin in users:
        print("\nLogin name already exist!\n")
    else:
        createPassw = input("Create password: ")
        users[createLogin] = createPassw
        print("\nUser created\n")

def oldUser():
    login = input("Enter login name: ")
    passw = input("Enter password: ")

    if login in users and users[login] == passw:
        print("\nLogin successful!\n")
    else:
        print("\nUser doesn't exist or wrong password!\n")

while status != "q":
    displayMenu()