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: Before last week 's blast , the restaurant 's owner had smelled gas and contacted the building 's owner , but did n't contact authorities . 2:  They should have called 911 ,  he said . 3: Emergency commissioner : Restaurant owner smelled gas , but did n't call 911 .

1: authorities 2: 911 3: 911