Recording input for replay system

Hi, I'm noob with Unity and I try to build a replay system for my game but I can't find how to do it correctly, actually I find a way to record the GameObject position and rotation, this is not bad but I need to record at least 1 input, I tried lots of assets from the asset store and even from github but none works as I need.

I need a simple script that can record 1 input (for example "Fire1") with a playback function, can you help me for this ?

Sorry for my poor english

Thanks