#include <iostream>
using namespace std;

int main()
{
	int n[2]; nr = 0;
	(while nr != 3)
	{
		cin >> n [nr];
		nr++;
	}
	for (int i = 0l i <= 3; i++)
	{
		if (n[i] >= 10 && n[i] <= 99)
		{
			cout<<n[i];
		}
	}
	return 0;
}