Question: How many acts are in the opera based on an 1820 poem by Alexander Pushkinhave, in which Mariya Matveyevna Stepanova created the lead soprano role?
Related documents: [0]  [DOC] Ruslan and Lyudmila (Russian: Руслан и Людмила , "Ruslan i Lyudmila") is an opera in five acts (eight tableaux) composed by Mikhail Glinka between 1837 and 1842. The opera is based on the 1820 poem of the same name by Alexander Pushkin. The Russian libretto was written by Valerian Shirkov, Nestor Kukolnik and N. A. Markevich, among others. Pushkin's death in the famous duel prevented him from writing the libretto himself as planned. [END] 
[1]  [DOC] Mariya Matveyevna Stepanova (Russian: Мария Матвеевна Степанова) (1811 or 1816 – 1903) was a Russian opera singer who created the leading soprano roles in "A Life for the Tsar", "Ruslan and Lyudmila", and "Dmitry Donskoy". [END] 
Answer: 
five
five