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 invade', Sentence: 'When it was reported that Russia had invaded Georgia unprovoked , I remembered reading where one of McCain campaign advisors was until just recently a lobbyist for Georgia .'

Ex Output:
invaded


Ex Input:
Given Relationship: 'be key to', Sentence: 'As present processes are thought to explain all past events , the Uniformitarianism slogan is " the present is the key to the past . "'

Ex Output:
key


Ex Input:
Given Relationship: 'attack', Sentence: 'On the other hand they exploded with headlines such as Russia attacks Georgia , 2000 people have been killed !'

Ex Output:

attacks