import java.util.*;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int n = sc.nextInt();
        String[] aArr = new String[n];
        for (int i = 0; i < n; i++) {
            aArr[i] = sc.next();
        }
        String[] bArr = new String[n];
        for (int i = 0; i < n; i++) {
            String s = sc.next();
            if (!aArr[i].equals(s)) {
                System.out.println(i + 1);
                System.out.println(aArr[i]);
                System.out.println(s);
                return;
            }
        }
    }
}