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 mayor of', Sentence: 'And former New York mayor Rudy Giuliani suggested men of a certain age get checked for prostate cancer , following in the footsteps of former US senator Bob Dole , whose appearances in Viagra ads are credited with persuading more men to discuss erectile dysfunction with their doctors .'

Ex Output:
mayor


Ex Input:
Given Relationship: 'be friend of', Sentence: 'I have always taken the position that Israel is a friend of the United States , and that friends should always stand up for one another , even in difficult times .'

Ex Output:
friend


Ex Input:
Given Relationship: 'be president of', Sentence: 'Islamabad , Nov 23 Former Pakistan military president Pervez Musharraf Sunday left for London on a one-week tour , the first trip abroad since he resigned in August .'

Ex Output:

president