Please answer the following question: I am a movie director and I just received the following movie plot. Could you help me answer this question? If not, let me know by writing "Not answerable". Plot title: The Mirror Movie plot: Structure and content[edit] Mirror depicts the thoughts, emotions and memories of Alexei, or Alyosha (Ignat Daniltsev), and the world around him as a child, adolescent, and forty-year-old. The adult Alexei is only briefly glimpsed, but is present as a voice-over in some scenes including substantial dialogue. The structure of the film is discontinuous and nonchronological, without a conventional plot, and combines incidents, dreams and memories along with some news-reel footage. The film switches among three different time-frames: prewar (1935), war-time (1940s), and postwar (1960s or '70s). Mirror draws heavily on Tarkovsky's own childhood. Memories such as the evacuation from Moscow to the countryside during the war, a withdrawn father and his own mother, who actually worked as a proof-reader at a printing press, feature prominently. Synopsis[edit] The film opens with Alexei's adolescent son Ignat (also played by Ignat Daniltsev) switching on a televisor and watching the examination of a stammerer by a physician. After the opening titles roll, a scene is set in the countryside during prewar times in which Alexei's mother Maria (Margarita Terekhova) also called Masha and Marusya talks with a doctor (Anatoli Solonitsyn) who chances to be passing by. The exterior and interior of Alexei's grandfather's country house are seen. The young Alexei, his mother and sister watch as the family barn burns down. In a dream sequence Maria is washing her hair. Now in the postwar time-frame, Alexei is heard talking with his mother Maria on the phone while rooms of an apartment are seen. Switching back to the prewar time-frame, Maria is seen rushing frantically to her work-place as a proof-reader at a printing press. She is worrying about a mistake she may have overlooked, but is comforted by her colleague Liza (Alla Demidova), who then abruptly reduces her to tears with withering criticism. Back in postwar time, Alexei quarrels with his wife, Natalia (also played by Margarita Terekhova), who has divorced him and is... My question: Who wrote the letter Ignat reads?
A:
Pushkin