import java.lang.String;

record Point(int x, int y) {}
interface Shape {}
record ColoredPoint(Point pt, String color) {}
record Rectangle(ColoredPoint upperLeft, ColoredPoint lowerRight) implements Shape {}
sealed class Color permits Blue, Red {}
class Blue extends Color {}
class Red extends Color {}

class PatternMatching {
void printColorOfUpperLeftPoint(Shape shape)
{
    switch (shape) {
        case Rectangle(ColoredPoint(Point pt, String color), ColoredPoint lowerRight) -> System.out.println("x: " + pt.x() + " / color: " + color + " / lowerRight: " + lowerRight);
        default -> System.out.println("not a rectangle");
    };
}
}
