Move only to left in a Endless Runner

Hey guys! I need your help ;D I’m making a Endless Runner with 2 characters on Unreal Engine 4. Now, my question is: How can I make my character go left when I tap Left Arrow button, and return to the initial position when I release it, but nothing happens when I tap the right button? (I think that i need to do it in a Blueprint) Thanks!

Have you seen this playlist?

[video][/video]

Yes, I’m watching this playlist to make this game, but there is no a tutorial to make what I want to do.