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: And so , a century ago , some American dreamers decided to drain the swamp . 2: After a century of development , half the Everglades is dead and the other half is on life support . 3: The Everglades were drained a century ago and are now being restored .

1: a century 2: a century 3: a century