Definition: In this task, you're given a passage, further information available on a particular linked term from the statement, and an answer term. Your job is to generate a question that can use the information provided to obtain the given answer. You should use the information on both passage and link information to create the question. Note that the answer to the question should be exactly the given answer, and if the answer is none, the answer to the question shouldn't be obtainable from the passage or linked information.
Input: Passage: Karena has worked as a professional theatre director since 1997. Her work include "40" by Angie LeMar at Hackney Empire Crossings by Julie McNamara at Cochrane Theatre "Safe" by David Herminstien at West Yorkshire Playhouse"Sweet Yam Kisses" which was conceived by her and written by Courttia Newland and Pat Cumper at the Lyric Hammersmith,"The Bridge" by Pedro Obaseki, an international co-production between Oval House Theatre and Don Pedro productions Nigeria; "The Oddest Couple" by Geoff Aymer at the Theatre Royal Stratford East; "Vengeance" by Wayne Buchanan on a National Tour; "Yerma" by Federico Garcia Lorca at the Young Vic/ Jerwood Space; "The Key Game" by Pat Cumper at the Riverside Studios; "The Front Room" by Jenny Davis on a National Tour; "Under Their Influence" by Wayne Buchanan at the Tricycle Theatre; "Angie Baby" by Rommie Smith at the Young Vic; "Gods and Bad Guys" by Tunde Euba; "Two" by Jim Cartwright; and EMMA Award nominated premier production of Vengeance by Wayne Buchanan at the Oval House Theatre.
Link Information: The Cochrane Theatre was a receiving and producing theatre situated in Holborn, London, that opened in 1964. Answer: 33
Output:
How long had Cochrane Theatre been in existence for the year Johnson began working as a professional theatre director?