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: The number of law enforcement officers shot to death in the line of duty rose more than 50 % in 2014 , the law enforcement group said in a report released in December . 2: Fifty officers were killed by firearms -- 15 in ambush attacks -- in 2014 , the Memorial Fund said . 3: National Law Enforcement Officers Memorial Fund : Of the 50 , 15 were killed in ambushes .

1: law enforcement officers 2: officers 3: National Law Enforcement Officers