TachVaTimTu

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package ktgk;

import java.util.*;

/**
 *
 * @author nguyenanhkiet
 * Tach va tim tu
 */
public class KTGK {

    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) {
        Scanner cin = new Scanner(System.in);
        int t = Integer.parseInt(cin.nextLine());
        while(t-->0){
            String s1 = cin.nextLine();
            String s2 = cin.nextLine();
            ArrayList<String> check = new ArrayList<>();
            String s1t[] = s1.trim().split("\\s+");
            for(String i : s1t){
                check.add(i.toLowerCase());
            }
            String s2t[] = s2.trim().split("\\s+");
            for(String i : s2t){
                String temp = i.toLowerCase();
                int before = Collections.frequency(check, temp);
                check.add(temp);
                int after = Collections.frequency(check, temp);
                if(after - before == 1 && before != 0){
                    System.out.print(i + " ");
                }
            }
            System.out.println();
        }
    }

}