Describe the legal relationship arising

Describe the legal relations arising in the following situations (determine their industry affiliation, describe the structure and elements), and also name and characterize the legal facts on the basis of which they arose.
a) Citizen Smirnov and Citizen Dmitriev concluded a contract of sale of a residential building located at the address: Sverdlovsk Region, pos. Gagarsky, Solnechnaya St., 6. at the price of 6 500 000 rubles.
b) The verdict of the court citizen Antonov was found guilty of an offense under Part 1 of Art. 116 of the Criminal Code of the Russian Federation (causing beatings that caused physical pain, but did not entail the consequences specified in Article 115 of the Criminal Code of the Russian Federation), and he was sentenced to 100 hours of compulsory labor.