Let PHI: G -> K be a homomorphism and G finite. Show that if K has an element of order 8 then G has an element of order 8.

Attempt:

I am not really sure how to proceed since PHI is only a homomorphism I do not know if there is an element in G such that it maps to the element in K with order 8.

You guys have any hints?

EDIT::

PHI is also ONTO!!!