You are given a base class Animal with a virtual function speak() that prints "..." and a virtual destructor.

Create two derived classes:
1. Dog - publicly inherits from Animal, overrides speak() to print "Woof"
2. Cat - publicly inherits from Animal, overrides speak() to print "Meow"

Both classes need constructors and properly overridden speak() functions. The test will create both objects through base class pointers to demonstrate polymorphism.

Do NOT include a main function. Your code will be tested automatically.

Expected output:
Woof
Meow