Question

In guinea pigs, black cot is dominant to albino. Rough coat us dominant to smooth coat. A black smooth guinea pig was mated with an albino rough guinea pig. Their offspring were black rough and black smooth. If these were the only produced over a period of years of matings, what was the possible genotype of each parent?
PsyDAG
One is either BBss or Bass; the other is aaRs or aaRR. Which combination would always give a Black coat and only sometimes a smooth coat?