#include <stdio.h>
int main (void){
	int N;
	char S[10][21],T[10][21];		//	[10: N] [21: 最大文字数+1]
	
	scanf("%d",&N);
	
	for(int k = 0; k < N; k++){
		scanf("%s",S[k]);
	}

	for(int l = 0; l < N; l++){
		scanf("%s",T[l]);
	}
	
	for(int i = 0; i < N; i++){
		for(int j = 0; S[i][j] != 0; j++){
			if(S[i][j] != T[i][j]){
				printf("%d\n%s\n%s\n",i+1,S[i],T[i]);
				return 0;
			}
		}
	}
	
	return 0;
}