Ap fruit fly lab help?

What would a monohybrid cross look like between Red eyed fruit flies and Sepia eyed fruit flies? The phenotype of the Parental Generation are red eyes and sepia eyes. These will breed and form the next generation. I am supposed to do a punnet square representing the F1 generation, but the F1 generation from the parental generation yielded only red eyed flies? So, what would my punnet square look like for the f1 generation?

Ap fruit fly lab help?
Your parental generation is:

R R

r Rr Rr

r Rr Rr

That ^ is the F1 Generation



Rr

R RR Rr

r Rr rr

That ^ is the F2 Generation



10 points please :)