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: An Ig Nobel Prize , that is . 2: This year marks their 25th anniversary , so what better time to celebrate the Ig Nobels ' contribution to the research community ? 3: The Ig Nobel Prizes will celebrate their 25th anniversary in September this year .

1: An Ig Nobel Prize 2: the Ig Nobels 3: The Ig Nobel Prizes