125. Abstract Operation

You are given a base class Operation that represents a mathematical operation.

Your task is to declare a pure virtual function inside the Operation class so that it becomes an abstract base class.

Two derived classes already exist:

• SquareOp → calculates the square of a number
• CubeOp → calculates the cube of a number

The program will:

1. Read an integer value
2. Read an operation name ("square" or "cube")
3. Dynamically create the corresponding derived object
4. Invoke the operation using a base class pointer
5. Print the computed result

This problem focuses on runtime polymorphism and abstract interfaces, which are commonly used in embedded and firmware systems.

Input Specification

• One integer n
• One string opName
  • Possible values: "square" or "cube"

Input is provided in a single line, separated by space.

Output Specification

• Print a single integer value representing the result of the requested operation applied to n.

No extra spaces or newline characters are required.

Example 1

Input

5 square

Output

25

Example 2

Input

3 cube 

Output

27

Constraints

• n is a valid 32-bit signed integer
• Overflow behavior follows standard C++ int arithmetic
• Exactly one valid operation name will be provided
• Dynamic memory must be handled safely