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 president of', Sentence: 'A month after writing this , he became President of the United States when Richard M. Nixon resigned .'

Output: President


Input: Consider Input: Given Relationship: 'be president of', Sentence: 'Barrack Obama has finally got elected as the President of the United States of America , after months of hard work and his unwavering faith in the electorate .'

Output: President


Input: Consider Input: Given Relationship: 'present at', Sentence: 'Paper presented at the 10th Annual Conference of the International Association of Chinese Linguistics .'


Output: presented