/* 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);
	}
}