What are the reactants and what is the product of zn(s)+s(s)-> zns(s)

The reactants are the substances that start the chemical reaction, while the products are the substances that are produced due to the chemical reaction.

In the chemical reaction of the problem:

the substances on the left (Zn and S) are those that start the reaction, so they are the reactants, while the substance on the right (ZnS) is the one produced in the reaction, so it is the product.

Why the rest of the question?