In this task, you're given a question, along with a context passage. The passage will not have a direct answer to the question, but can include some information and a clue for the answer. Assuming you can only obtain information about one entity in the passage, your job is to determine whether information from the passage can be used to answer the question. Indicate your choice as `a` for Yes or `b` for No.

Input: Consider Input: Question: Who was the president of Atlantic Records in 1961? Passage:Ain't She Sweet was an American album featuring four tracks recorded in Hamburg in 1961 by The Beatles featuring Tony Sheridan (except for the title song with vocal by John Lennon) and cover versions of Beatles and British Invasion-era songs recorded by the Swallows. As Atlantic Records only had rights to four Sheridan/Beatle recordings recorded by Polydor Records, they filled the rest of the album with Beatle and British Invasion cover songs. When this material was released by Atco Records, there were mono (catalogue number 33-169) and stereo (SD 33-169) editions. Atco also added additional drum overdubs to the four Sheridan cuts on top of the original drum tracks. American drummer Bernard Purdie claims to have performed overdubs of unspecified Beatles records, which would most likely have been for Ain't She Sweet, but this has never been officially confirmed.


Output: a


Input: Consider Input: Question: How long was the fortification that the German Army retreated to? Passage:Adair fought in the First World War. He joined the British Army, receiving his commission as a probationary second lieutenant on 2 May 1916 in the 5th (Reserve) Battalion of the Grenadier Guards. From January 1917 onwards he served in the trenches of the Western Front in France and Belgium as part of the 2nd Company, 3rd Battalion, Grenadier Guards, with the rank of lieutenant. The battalion was part of the 2nd Guards Brigade of the Guards Division. Adair's first major battle was in the pursuit of the retreating German Army to the Hindenburg Line. The division then took part in the Battle of Passchendaele. Adair, however, took no part in the battle, due to an injury sustained in a bicycle accident in early July 1917. He returned to the battalion in January 1918.


Output: b


Input: Consider Input: Question: How long after the founding of Salt Lake City was Merion Estes born? Passage:Merion Estes (born Salt Lake City, Utah on September 5, 1938) is a Los Angeles-based painter. She earned a B.F.A. at the University of New Mexico, in Albuquerque, and an M.F.A. at the University of Colorado, in Boulder. Estes was raised in San Diego from the age of four. She moved to Los Angeles in 1972 and first showed her work at the Woman's Building in Los Angeles. As a founding member of Grandview 1 & 2, she was involved in the beginnings of Los Angeles feminist art organizations including Womanspace, and the feminist arts group, "Double X," along with artists Judy Chicago, Nancy Buchanan, Faith Wilding, and Nancy Youdelman. In 2014, Un-Natural, at the Los Angeles Municipal Art Gallery in Los Angeles, which included Estes' work, was named one of the best shows in a non-profit institution in the United States by the International Association of Art Critics.



Output: b