Mo. Rev. Stat. § 513.100

The person whose goods, chattels and real estate are taken in execution may elect what part thereof shall be first sold; and if he shall deliver to the officer having charge thereof a statement, in writing, of such election, three days before the day appointed for the sale, stating specifically what goods, chattels and real estate he desires to be first sold, and so on, until the execution be satisfied, the officer shall proceed according to such election, until sufficient money shall be made to satisfy the amount in the execution specified and costs.