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: ( CNN ) Robert Downey Jr . may be Iron Man in the popular Marvel superhero films , but he recently dealt in some advanced bionic technology himself . 2: Downey recently presented a robotic arm to young Alex Pring , a Central Florida boy who is missing his right arm from just above his elbow . 3:  Iron Man  star Robert Downey Jr. presents a young child with a bionic arm .

1: some advanced bionic technology 2: a robotic arm 3: a bionic arm