#include <stdio.h>
#include <string>
int main(){
    //input
    int N;
    scanf("%d",&N);

    char S[10][20+1];
    char T[10][20+1];
    for (int i = 0;i < N;i++){
        scanf("%s",S[i]);
    }
    for (int i = 0;i < N;i++){
        scanf("%s",T[i]);
    }

    //search
    int index;
    for (int i = 0;i < N;i++){
        if (std::string(S[i]) != std::string(T[i])){
            index = i;
            break;
        }
    }

    //output
    printf("%d\n",index+1);
    printf("%s\n",S[index]);
    printf("%s\n",T[index]);
    return 0;
}