package yukicoder;

import java.util.Scanner;

public class N547 {

	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();
		}
		int buf=-1;
		for(int i=0;i<N;i++)
		{
			T[i]=sc.next();
			if(!(S[i].equals(T[i])))
			{
				buf=i;
				i+=N;
			}
		}
		System.out.println(buf+1+"\n"+S[buf]+"\n"+T[buf]);
	}
}