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: On Tuesday , a U.S . RC-135U was flying over the Baltic Sea when it was intercepted by a Russian SU-27 Flanker . 2: The Pentagon said the incident occurred in international airspace north of Poland . 3: The incident occurred on April 7 north of Poland in the Baltic Sea .

1: over the Baltic Sea 2: international airspace north of Poland 3: north of Poland in the Baltic Sea