I have a certain class and i'm having difficulty setting up the`__init__` constructor. I need it to take in zero or more strings as arguments, each giving a city name and state abbreviation, and indicating a destination along a tour of US cities.

For example:

```
Tour("New York, NY", "Lansing, MI", "Los Angeles, CA")

```

represents a tour that starts in New York city, proceeds to Lansing, and ends in Los Angeles.

Any ideas how to go about doing this using python 3.3?