//6 week practicum problem B Step 1 and 2
//IC210 section 4002
#include <iostream>
#include <fstream>

using namespace std;

int main()
{
	int K = 0;
	int counter = 0;
	char c;

	cout << "key " << endl;
	cin >> K;


	cin >> c; //initialization
	counter = 1;
	while(c != 'X')
	{
		//process
		if (counter % K == 0)
		{
			cout << c;
		}


		//read next
		cin >> c;
		counter++;
	}


	cout << "Good bye" <<endl;
	
	return 0;
}