#include<bits/stdc++.h>
using namespace std;

int main(){
	int n,i;
	string s1[10],s2[10];
	scanf("%d",&n);
	
	for(i=0;i<n;i++){
		cin>>s1[i];
	}
	for(i=0;i<n;i++){
		cin>>s2[i];
	}
	
	for(i=0;i<n;i++){
		if(s1[i]!=s2[i]) break;
	}
	
	printf("%d\n",i+1);
	cout<<s1[i]<<"\n";
	cout<<s2[i]<<"\n";
	
	return 0;
}