Input consists of several test cases. Each test case consists of three lines containing:
- f, the number of features
- f coordinate pairs giving the vertices of the first polygon
- f coordinate pairs giving the vertices of the second polygon
The vertices for both polygons correspond to the same set of features in the same order; for example, right ear tip, chin cleft, right eye, nose, left eye, left ear tip, space between front teeth. Each polygon has f vertices; each vertex is given as an x and y coordinate pair. There are at least three and no more than ten features. Coordinates are integers between -1000 and 1000. A line containing 0 follows the last test case.