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

int main(void){
	int n,i;
	char s[16][32],t[16][32];
	scanf("%d",&n);
	for(i = 1;i <= n;i++){scanf("%s",s[i]);}
	for(i = 1;i <= n;i++){scanf("%s",t[i]);}
	for(i = 1;i <= n;i++){
		if(strcmp(s[i],t[i]) != 0){printf("%d\n%s\n%s\n",i,s[i],t[i]);}
	}
	return 0;
}