Can someone help me figure this out? I dont know how to work backwards to figure out the genetypes…

The pattern of coat coloration in dogs is determined by the alleles of a single gene, with S (solid) being dominant over s (spotted). Black coat color is determined by the dominant allele A of a second gene, and tan results from homozygosity for the recessive allele a. A female having a solid tan coat is mated with a male having a solid black coat and produces a litter of six cute little pups. The phenotypes of the pups are: 2 solid tan, 2 solid black, 1 spotted tan and 1 spotted black. What are the genotypes of the parents.