#include <iostream>
using namespace std;

int main()
{
    int n;
    cin >> n;
    int pomosna = n;
    int dolzina = 0;
    while(pomosna > 0) {
        dolzina++;
        pomosna /= 10;
    }
    dolzina /= 2;
    int cifra;
    while(dolzina >= 0) {
        cifra = n % 10;
        n /= 10;
        dolzina--;
    }
    cout << cifra << endl;
    return 0;
}