/* package whatever; // don't place package name! */
 
import java.util.*;
import java.lang.*;
import java.io.*;
 
/* 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
	{
		HashSet hs = new HashSet();
		hs.add('C');
		hs.add('E');
		hs.add('D');
		hs.add('B');
		hs.add('A');
		System.out.println(hs);
		System.out.println(hs.size());
		hs.clear();
		System.out.println(hs);
	}
}

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