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.

Input: Consider Input: Given Relationship: 'be son of', Sentence: 'Our hope is to know God and His son Jesus fully and to be in fellowship with them forever .'

Output: son


Input: Consider Input: Given Relationship: 'be president of', Sentence: 'Now George W. Bush is the President of the United States .'

Output: President


Input: Consider Input: Given Relationship: 'be city in', Sentence: 'New York is among the busiest cities in the United States of America .'


Output: cities