#include <stdio.h>
int main() {
    int n;
    if (scanf("%d", &n) != 1 || n <= 0) {
        printf("Invalid input");
        return 0;
    }
    char arr[100];
    char count = 0;
    while (count < n && scanf("%255s", token) == 1) {
        arr[count++] = token[0];
    }
    if (count < n) {
        printf("Invalid input\n");
        return 0;
    }
    int mid = n / 2;
    printf("%d\n", (int)arr[mid]);
    return 0;
}