program528.java

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

import java.util.*;
public class program528
{
    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 );
            }
        }

        int i =0;
        String newStr = "";
        for(String s: hobj.keySet())
        {
            if(hobj.get(s) >= 1)
            {
                newStr  = newStr + s;
                newStr  = newStr + " ";

            }   
        }
        System.out.println(newStr.trim());
    }
}