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: St . Louis police have charged Ronald Williams , 21 , with assault . 2: Two other males joined in , police said . 3: The two males arrested are 21 and 15 years old , St. Louis police say in a tweet .

1: St . Louis police 2: police 3: St. Louis police