import java.util.*;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int n = sc.nextInt();
        ArrayList<String> allList = new ArrayList<>();
        HashSet<String> outSet = new HashSet<>();
        for (int i = 0; i < n; i++) {
            String a = sc.next();
            String b = sc.next();
            allList.add(b);
            outSet.add(a);
        }
        StringBuilder sb = new StringBuilder();
        HashSet<String> putSet = new HashSet<>();
        for (String s : allList) {
            if (!outSet.contains(s) && !putSet.contains(s)) {
                sb.append(s).append("\n");
                putSet.add(s);
            }
        }
        System.out.print(sb);
    }
}