#include <iostream>
#include <sstream>

int main()
{
	std::istringstream infile ("100 90 80 78 67 56 20 78 99 54 89 100 90 80");
	for(int i = 0, num; infile >> num; ++i)
	{
	    if(i%3 == 0)
	    {
	        std::cout << num << " " << std::flush;
	    }
	}
}