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: 'be president of', Sentence: 'Tomorrow Barack Obama will become president of the United States .'

Ex Output:
president


Ex Input:
Given Relationship: 'surrender at', Sentence: 'When Cornwallis surrendered at Yorktown it is said while the British played The World Turned Upside Down , the Americans played Yankee Doodle .'

Ex Output:
surrendered


Ex Input:
Given Relationship: 'be know of', Sentence: 'Write a little blurb about any William Aarnes 's you might know .'

Ex Output:

know