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: Moscow ( CNN ) In his first substantive comments since Kremlin critic Boris Nemtsov 's death , Russian President Vladimir Putin on Wednesday called the killing a  disgrace  and lashed out at what he called  extremists  and protesters . 2: Referring to  the daring killing of Boris Nemtsov in the very heart of our capital city ,  he said ,  Russia should be made secure , at last , from the disgrace and tragedies of ( this ) kind .  3: Vladimir Putin : Russia should be safe from  disgrace and tragedies  like Nemtsov 's killing .

1: Kremlin critic Boris Nemtsov 's death 2: the daring killing of Boris Nemtsov 3: Nemtsov 's killing