import java.util.Scanner;
import java.lang.Math;
import java.lang.StringBuilder;
import java.util.regex.Pattern;
import java.util.Arrays;


    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[] t = new String[n];
            for(int i=0;i<n;i++){
                s[i] = sc.next();
            }
            
            
            for(int j=0;j<n;j++){
                t[j] = sc.next();
            }
            

            int ans = 1;
            for(int k=0; k<n; k++){
                if(s[k].equalsIgnoreCase(t[k])){
                    ans ++;
                }else{
                    break;
                }
            }
            
            System.out.println(ans);
            System.out.println(s[ans-1]);
            System.out.println(t[ans-1]);
        }
    }