Zalora

import java.io.IOException;
import java.util.ArrayList;
import java.util.HashMap;


public class Dice {
    public static void main(String[] args) throws IOException{
        //Create List A with Zalora Emails
        String lista[]={"pawansahai@live.com","pawan29sahai@gmail.com"};
        //Create List B with third party emails
        String listb[]={"pawansahai1@live.com","pawan29sahai@gmail.com","pawan29sahai2@gmail.com"};
        //sizes
        int n1=lista.length;
        int n2=listb.length;
        //Output Arraylist
        ArrayList<String> ar=new ArrayList<String>();
        //Hashmap to remove duplicates
        HashMap<String,String> hm=new HashMap<>();
        for(int i=0;i<n1;i++){
            //set both keys and values in hashmap of list A
            hm.put(lista[i],lista[i]);

        }
        for(int i=0;i<n2;i++){
            //check if the email already exists
            if(hm.containsKey(listb[i])){
                hm.put(listb[i],listb[i]);
            }
            else{
                //unique email id
                ar.add(listb[i]);
            }


        }
        //Output the result
        for(int i=0;i<ar.size();i++){

            System.out.println(ar.get(i));
        }


    }
}