Given the task definition, example input & output, solve the new input case.
In this task, you will be given a passage to read. A fill in the blank question will be given to you.  Your answer should fit the blank appropriately.
Example: The music was composed by Hitoshi Sakimoto , who had also worked on the previous Valkyria Chronicles games . When he originally heard about the project , he thought it would be a light tone similar to other Valkyria Chronicles games , but found the themes much darker than expected . An early theme he designed around his original vision of the project was rejected . He redid the main theme about seven times through the music production due to this need to reassess the game . The main theme was initially recorded using orchestra , then Sakimoto removed elements such as the guitar and bass , then adjusted the theme using a synthesizer before redoing segments such as the guitar piece on their own before incorporating them into the theme . The rejected main theme was used as a hopeful tune that played during the game 's ending . The battle themes were designed around the concept of a  divorced from a fantasy scenario by using modern musical instruments , constructed to create a sense of atonality . While Sakimoto was most used to working with synthesized music , he felt that he needed to incorporate live instruments such as orchestra and guitar . The guitar was played by Mitsuhiro Ohta , who also arranged several of the later tracks . The game 's opening theme song ,  ( もしも君が願うのなら , Moshimo Kimi ga Negauno Nara ) , was sung by Japanese singer May 'n . Its theme was the reason soldiers fought , in particular their wish to protect what was precious to them rather than a sense of responsibility or duty . Its lyrics were written by Seiko Fujibayashi , who had worked on May 'n on previous singles . fill in the blank  : The music was composed by Hitoshi __________________ , who had also worked on the previous Valkyria Chronicles games
Output: Sakimoto
This a good example. The actual line from the passage is The music was composed by Hitoshi Sakimotos, In the given sentence, it is stated clearly that Sakimoto answers the question correctly.

New input case for you:  The second stage of construction in the 17th and 18th centuries , when the tower was under the charge of the Vatican librarian , involved Mgr . Filippo Luigi Gilii , a clergyman of St. Peter 's Basilica . Earlier in 1797 , Pius VI gave approval to placing a Latin inscription Specula Vaticana at the entrance to the upper part of the tower , which was implemented by Cardinal Zelada with plans to enhance the instrumentation system in the tower 's observatory . The original observatory was then set up above the second level of the tower with the agreement of Pope Pius VI . Its instrumentation , apart from many normal devices ( such as meteorological and magnetic equipment , with a seismograph and a small transit and pendulum clock , ) was noted for the Dolland Telescope . The instrumentation facilitated recording of occurrences of eclipse , appearance of comets , Satellites of Jupiter and Mercury ’ s transit . As an addition , under the patronage of Pope Pius X , four rotary observatory domes were also added at strategic locations on the 1 @,@ 300 feet ( 400 m ) long fortification walls , more than a thousand years old . Mgr . Gilii , highly respected as a polyglot with a knowledge of physics , biology , archeology and the Hebrew language , was in charge of the observatory from 1800 to 1821 . He carried out continuous meteorological observations ( twice a day at 6 AM and 2 PM ) conforming to the programme of the Mannheim Meteorological Society . While the observation records for seven years were published , the balance data in a manuscript form was preserved in the Vatican Library . Subsequent to Gilii 's death in 1821 , the observatory on the tower was discontinued and the instruments were moved to the observatory at the Roman College . Established in 1787 , it was considered more suitable for making observations than the Vatican . fill in the blank  :  The second stage of construction in the 17th and __________________ centuries , when the tower was under the charge of the Vatican librarian , involved Mgr . 
Output:
 18th 