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.

Example Input: Given Relationship: 'be country in', Sentence: 'Canada and the countries of the Americas are proceeding with Summits and many economic liberalisation negotiations , which , if realised , will transform the political , environmental , social and economic geography of the Western Hemisphere .'
Example Output: countries

Example Input: Given Relationship: 'become', Sentence: 'The organization which evolved was the guts of the unit which became the OSS and later the CIA .'
Example Output: became

Example Input: Given Relationship: 'be president of', Sentence: 'The only way we can realize the promise of is to elect Barack Obama the next president of the United States of America , Clinton told convention delegates .'
Example Output:
president