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 city in', Sentence: 'Dublin is the Capital city of Ireland .'

Ex Output:
city


Ex Input:
Given Relationship: 'attack', Sentence: 'The Japanese attack on Pearl Harbor on Dec. 7 , 1941 led soldiers of the 28th to remain on active for the duration of the war .'

Ex Output:
attack


Ex Input:
Given Relationship: 'be president of', Sentence: 'Barack Obama was sworn in and has officially become President of the United States .'

Ex Output:

President