Could you please tell me the hotkey for the “split creatures” command?

I didn't know for a long time how to split creatures in Heroes of Might and Magic V, because in Heroes of Might and Magic III I was used to clicking the button with the mouse. Then someone enlightened me. And just a couple of months ago, Kot enlightened me that you can split and merge units directly in battle, when deploying armies. I didn't know that before and didn't use it.