/* package whatever; // don't place package name! */
 
import java.util.*;
import java.lang.*;
import java.io.*;
import java.util.regex.*;
/* Name of the class has to be "Main" only if the class is public. */
class Ideone
{
	public static void main (String[] args) throws java.lang.Exception
	{
		String str = "the_B-NP camera_I-NP is_B-VP very_B-ADJP easy_I-ADJP to_B-VP use_I-VP ,_O in_B-PP fact_B-NP on_B-PP a_B-NP recent_I-NP trip_I-NP this_B-NP past_I-NP week_I-NP i_I-NP was_B-VP asked_I-VP to_B-VP take_I-VP a_B-NP picture_I-NP of_B-PP a_B-NP vacationing_I-NP elderly_I-NP group_I-NP ._O ";
    	Pattern ptrn = Pattern.compile("\\S*_I+\\S*");
    	Matcher matcher = ptrn.matcher(str);
    	List<String> lst = new ArrayList<>();
    	while (matcher.find()) {
    		lst.add(matcher.group());
    	}
    	System.out.println(lst);
	}
}

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