Next / Previous Post

I have encountered a problem that I don’t know how to solve. At the bottom of each post I have links to Previous and Next post. Screenshot here: http://i.imgur.com/fhJNfEC.png Live URL here: http://www.sadanduseless.com/2015/09/ridiculous-conspiracy-theories/

As you can see titles are too long, so the layout doesn’t look good.

I would like to use “← Previous Post” and “Next Post →” instead of titles. Is there a way to do that? Thanks in advance!