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

int main(void)
{
    int N,j,i;
    scanf("%d",&N);
    char a[N][20],b[N][20];
    for (i = 0; i < N; i++) {
        scanf("%s",a[i]);
    }
    for (i = 0; i < N; i++) {
        scanf("%s",b[i]);
    }
    for (i = 0; i < N; i++) {
        for (j = 0; j < strlen(a[0]); j++) {
            if (a[i][j] != b[i][j]) {
                break;
            }
        }
        if (a[i][j] != b[i][j]) {
            break;
        }
    }
    printf("%d\n%s\n%s\n",i + 1,a[i],b[i]);
    return 0;
}