program525.java

// demo hello pune demo code hello india ppa lb hello
/*.  
 * 
 *  demo.  
 *  hello  
 *
 * 
 * 
 * 
 */

import java.util.*;
public class program525
{
    public static void main(String[] args) 
    {
        Scanner sobj = new Scanner(System.in);

        System.out.println("Enter string: ");

        String str = sobj.nextLine();

        str = str.trim();

        str = str.replaceAll("\\s+", " ");

        String tokens[]  = str.split(" ");

        HashMap<String , Integer> hobj = new HashMap<String , Integer>();

        for(String s : tokens)
        {
            if(hobj.containsKey(s))
            {
                hobj.put(s,hobj.get(s)+1);
            }
            else
            {
                hobj.put(s,1 );
            }
        }

        for(String s: hobj.keySet())
        {
            if(hobj.get(s) >1)
            {
                System.out.println(s);
            }
            
        }
    }
}