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Walls and his team had already enjoyed five substantial hits at the Aldwych , with It Pays to Advertise ( 1923 ) , which had run for 598 performances ; A Cuckoo in the Nest ( 1925 , 376 performances ) ; Rookery Nook ( 1926 , 409 performances ) ; Thark ( 1927 , 401 performances ) ; and Plunder ( 1928 , 344 performances ) .
 Walls
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Walls