From the given sentence, extract the phrase (often noun or verb) that carries the given relationship. The generated phrase should be present in the sentence.

Ex Input:
Given Relationship: 'file to', Sentence: 'July 9th , 2002 - Coming this fall , Nintendo 's Game Boy To Play MP3 and WMA files using a $ 99 add-on component .'

Ex Output:
files


Ex Input:
Given Relationship: 'be capital of', Sentence: 'To visit Machu Picchu you must spend at least 2 nights in Cuzco which was the capital of the Inca empire and has many archaeological ruins in the city and nearby .'

Ex Output:
capital


Ex Input:
Given Relationship: 'be focus of', Sentence: 'The Glaucoma Research Center at Wills Eye Institute focuses and coordinates these efforts to discover and disseminate sight-saving knowledge around the world .'

Ex Output:

focuses