/* 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 = new ArrayList<String>();
		list.add("a");
		list.add("b");
		list.add("c");
		list.add("d");
		list.add("b");
		list.add("c");
		list.add("a");
		list.add("a");
		list.add("a");
 
		Map<String, Long> counted = list.stream().collect(Collectors.groupingBy(e -> e, Collectors.counting()));
 
		System.out.println(counted);
	}
}

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