#include <bits/stdc++.h>
#define FOR(i,a,b) for(int i = (a); i < (b); ++i)
#define REP(i,n) FOR(i,0,n)
#define SZ(n) (int)(n).size()
#define ALL(n) (n).begin(), (n).end()
using namespace std;
typedef long long LL;
typedef vector<int> VI;

int main() {
	int n;
	vector<string> s, t;
	cin >> n;
	REP(i, n) {
		string st;
		cin >> st;
		s.push_back(st);
	}
	REP(i, n) {
		string tt;
		cin >> tt;
		t.push_back(tt);
	}
	int ans;
	REP(i, n) {
		if (s[i] != t[i]) {
			ans = i;
			break;
		}
	}
	cout << ans + 1 << endl;
	cout << s[ans] << endl;
	cout << t[ans] << endl;
	return 0;
}