Write the next sentence in the following story.

How to save for retirement as a digital nomad
Track your expenses carefully.
When you're traveling to exotic locales, it can be tempting to spend extravagantly so you get the most out of the experience. However, if you intend to also save for retirement, you must have a good idea of how much you need to spend to survive.
Start by writing down your regular expenses-those that won't change regardless of your location. For example, if you have a mobile phone bill that is always $100 a month, budget that expense and any other similar expenses first.