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

int main() {
    int N, i;
    char S[10][20] = {{'\0'}, {'\0'}, {'\0'}, {'\0'}, {'\0'}, {'\0'}, {'\0'}, {'\0'}, {'\0'}, {'\0'}};
    char T[10][20] = {{'\0'}, {'\0'}, {'\0'}, {'\0'}, {'\0'}, {'\0'}, {'\0'}, {'\0'}, {'\0'}, {'\0'}};
    scanf("%d", &N);
    for (i = 0; i < N; i++) {
        scanf("%s", S[i]);
    }
    for (i = 0; i < N; i++) {
        scanf("%s", T[i]);
    }
    for (i = 0; i < N; i++) {
        if (strcmp(S[i], T[i]) != 0) {
            printf("%d\n%s\n%s\n", i+1, S[i], T[i]);
            break;
        }
    }
    return 0;
}