How to Type Scharfes S on Czech Keyboard?

This is a scharfes S: ß
How to type this letter using Czech keyboard?

Czech QWERTY: AltGr+\

Screenshot 2016-02-02 13.10.03

Czech QWERTZ: AltGr+§

cz qwertz altgr

Or use Alt key and num keys: Alt + 0 2 2 3