#include <iostream>
#include <string>

int main()
{
    std::string sampleName;
    char middle;

    std::getline(std::cin, sampleName);
    
    for (int i = 0; i < sampleName.size(); i++)
    {
        if (sampleName[i] == '.')
        {
            middle = sampleName[i-1];
            break;
        }          
    }

    std::cout << middle << std::endl;

    return 0;
}