/* package whatever; // don't place package name! */
 
import java.util.*;
import java.lang.*;
import java.io.*;
import java.util.stream.*;
 
/* 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
	{
 
		List<String> list = Arrays.asList(new String[]{"a","b","c","a","a","a","a","d","d","d","c","c","e","e","e","e","e","e","f","f","f","g"});
		List<String> acc = IntStream
            .range(0, list.size())
            .filter(i -> ((i < list.size() - 1 && list.get(i) != list
                    .get(i + 1)) || i == list.size() - 1))
            .mapToObj(i -> list.get(i)).collect(Collectors.toList());
        System.out.println(acc);
	}
}

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