Definition: You will be given three sentences. Read them, then identify a noun phrase (person, place, or thing) or event that is shared between all three sentences. As the output, write the span of the text corresponding to that phrase in each sentence. Keep the order of the sentences, that is, your answer should look like: 1: *a phras from sentence 1e* 2: *a phras from sentence 2* 3: *a phrase from sentence 3*
Input: 1: Washington ( CNN ) ISIS is a problem that is  off the charts historically  and has sent the United States into  uncharted territory  when it comes to putting down the terror group , the Obama administration 's point man in the fight recently told CNN . 2: McGurk did not rule out expanding U.S . military action beyond Iraq and Syria to combat the increasing regional threat . 3: Obama 's point man in ISIS fight does n't rule out U.S. military action beyond Iraq and Syria .

1: the United States 2: U.S 3: U.S.