/* 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
	{
		Scanner x = new Scanner(System.in);
		Set<String> indexedContentSet = new HashSet<>();
		Set<String> set = new HashSet<>();
 
		String tmp;
 
		for (int i = 0;i < 12;i++) {
			tmp = x.nextLine();
			String arr[] = tmp.split("\\s+");
 
			for (String y: arr) {
 
				if (y.length() > 3) {
 
					if (set.contains(y)) {
						indexedContentSet.add(y);
					}
 
					set.add(y);
				}	
			}
		}
 
		System.out.println(indexedContentSet);
		System.out.println(set);
	}
}

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Supervised and Unsupervised 
Learning
Agenda
Introduction
Supervised Learning
Unsupervised Learning
What is ML ?
Field of study that gives computers the 
ability to learn without being explicitly 
programmed
Uniformity of cell size
Uniformity of cell shape