#include <iostream>

using namespace std;

string read(int* n)
{
	string str, prev;
	cin >> str;
	(*n)++;
	if(cin.eof())
	{
		*n = ((*n) / -2)*(-1);
		return "";
	}
	prev = read(n);
	if(!(*n))
	{
		return prev;
	}
	(*n)--;
	return prev + str + "\n";
}
int main()
{
	int n = 0;
	cout << read(&n);
	return 0;
}