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: However , it is encouraging that both Shia and Sunni fighters are supporting the army in its effort to defeat ISIS . 2: Politically , these groups may not see eye-to-eye and of course there remain deep ethno-sectarian tensions in Iraq and beyond , but regardless of these differences they all view ISIS as a common threat and enemy that must be defeated . 3: Both Shia and Sunni groups view ISIS as a common threat and enemy that must be defeated , he adds .

1: ISIS 2: ISIS 3: ISIS