import java.util.*;

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