#include <stdio.h>
#include <algorithm>
using namespace std;
using ll = long long;

int main() {
	int n, p, res;
	scanf("%d", &n);
	char s[10][21], t[10][21];
	for (int i = 0; i < n; i++)
		scanf("%s", s[i]);
	for (int i = 0; i < n; i++)
		scanf("%s", t[i]);

	for (int i = 0; i < n; i++)
		for (p = 0; s[i][p] != 0 && t[i][p] != 0; p++)
			if (s[i][p] != t[i][p])
				res = i;

	printf("%d\n%s\n%s\n", res + 1, s[res], t[res]);
}