#if 0

#include <iostream>
#include <cmath>

// This program plots a sequence of "moves"
// of the form (1.2, 3.4) 
// stop when read in a 'q'

using namespace std;

struct Point {
	double x, y;
};



Point operator+(Point p1, Point p2)
{
	Point p3;
	p3.x = p1.x + p2.x;
	p3.y = p1.y + p2.y;
	return p3;
}

Point operator/ (Point p, int factor)
{
	p.x = p.x / factor;
	p.y = p.y / factor;
	return p;
}

Point calcMidpoint(Point p1, Point p2) 
{
	Point mid = (p1 + p2) / 2;
	return mid;
}

int main() 
{
	// Initialize location
	Point loc;
	Point move;
	loc.x = loc.y = 0;

	// Read in bunch of moves
	while(true) 
	{

	
		// Read one move
		char junk;
		cin >> junk;
		if (junk == 'q') 
		{
			break;
		}
		cin >> move.x >> junk >> move.y >> junk;

		// Compute midpoint between 'move' and 'loc'
		Point mid = calcMidpoint(loc, move);
		cout << "     mid is: " << mid.x << " , " << mid.y << endl;

		// Update position
		loc = loc + move;
		
		// Output position
		cout << "Now at: " << loc.x << " , " << loc.y << endl;
	}

	return 0;
}

#endif