The picture illustrates inheritance. Write a class System to reflect the following features:

$$ The class for Aircraft should be an abstract declared class with two abstract methods of your choice and constructor with two variables describing the Aircraft.

$$ The subclass should use extends and Super to the Airplane class with an additional variable$($s$).$

$$ The constructor of the grandchild class should have $5$ parameters: the first $3$ are the same as for Civilian or fighters

$$ One additional method is needed in the grandchild classes.

$$ Add one method that will reflect the concept of polymorphism.

$$ The toString method needs to call the toString method of the parent

Compile and run the program. Make sure it is working properly.