#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;
}
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