You will be given a definition of a task first, then some input of the task.
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.

Given Relationship: 'be discover by', Sentence: 'But poor Pluto , discovered by Clyde Tombaugh in 1930 at the Lowell observatory in Flagstaff , Arizona , is now struggling mightily to maintain its status as a planet .'
Output:
discovered