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 son of', Sentence: 'And Gideon the son of Joash died4 in a good old age , and was buried11 in the sepulchre of Joash his father , in Ophrah of the Abiezrites .'
Example Output: son

Example Input: Given Relationship: 'be president of', Sentence: 'Remember just a few short years ago ? Bill Clinton was President of the United States , Tony Blair was a popular figure , the Patriots still sucked , and virtually every male you knew would watch professional wrestling on a Monday Night .'
Example Output: President

Example Input: Given Relationship: 'be president of', Sentence: 'The mounting evidence indicates that Barack Obama is morally unqualified to be the president of the United States of America .'
Example Output:
president