#define _CRT_SECURE_NO_WARNINGS
#include <stdio.h>
#include <string.h>

int main(void) {
	int N;
	char s[10][21], t[10][21];

	scanf("%d", &N);
	for (int i = 0; i < N; i++) 
		scanf("%s", &s[i]);
	for (int j = 0; j < N; j++)
		scanf("%s", &t[j]);

	for (int k = 0; k < N; k++) {
		if (strcmp(s[k], t[k]) != 0)
			printf("%d\n%s\n%s\n", k + 1, s[k], t[k]);
	}

	return 0;
}