The term 'COFFEE-GRINDER INPUT' is referring to the BEANS that are used as an input for a coffee grinder. Coffee BEANS are the seeds of the coffee plant, which are roasted and then ground up to make coffee. The BEANS are usually roasted to bring out their flavor and aroma, and then ground to the desired size for brewing. Coffee grinders are used to grind the BEANS into a fine powder, which is then used to make coffee.