#include <iostream>
#include <string>

using namespace std;

string flipper();
int main()
{
	for(int i=0; i<5; i++)
		cout << i<< ": "<<flipper() << endl;

}

string flipper()
{
	static int QS = 1;
	switch(QS){ case 1: goto Q1; case 2: goto Q2; case 3:goto Q3; }
	Q1:;
	while(true)
	{
	QS=2; return "Yes"; //resume("Yes");
	Q2:;
	QS=3; return "No"; //resume("No");
	Q3:;
	}
}