/* package whatever; // don't place package name! */

import java.util.*;
import java.lang.*;
import java.io.*;
import java.util.stream.Stream;

class Ideone
{
	public static void main (String[] args) throws java.lang.Exception
	{
		Stream<String> s = Stream.of("A", "B");
		s.map(String::toUpperCase);
		s.map(String::toLowerCase);
	}
}