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: Baghdad , Iraq ( CNN ) Joint Iraqi forces have started what they believe will be the conclusive push to retake the Iraqi city of Tikrit from ISIS , a paramilitary force participating in the offensive said Tuesday . 2: ISIS fighters have retreated toward the city center from frontline positions , Hashd Al-Shaab 's media office said Tuesday . 3: ISIS forces are retreating toward the center of Tikrit , says a Shiite force participating in the offensive .

1: ISIS 2: ISIS fighters 3: ISIS forces