import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int n = sc.nextInt();
		String[] s = new String[n];
		String[] x = new String[n];
		for(int i = 0 ; i < n ; i++) {
			s[i] = sc.next();
			x[i] = sc.next();
			if(!s[i].equals(x[i])) {
				System.out.println(s[i]);
				System.out.println(x[i]);
				return;
			}
		}
	}
}