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 homozygous recessive aa animals are tan. A female having a solid tan coat is crossed with a male having a solid black coat and produces a litter of six puppies. The phenotypes of the puppies are 2 solid tan, 2 solid black, 1 spotted tan, and 1 spotted black. What are the genotypes of the parents?