firstname = INPUT ("What is your firstname?")

The code you've provided mostly demonstrates sequencing, which is a fundamental concept in programming where statements are executed in a specific order, one after the other. In this case:

1. The program prompts the user to input their first name.
2. Then, it prompts the user to input their last name.
3. Finally, it prints a greeting using the provided names.

There is no visible iteration (looping) or selection (conditional statements) present in the code as it currently stands.

To elaborate on the programming concepts mentioned:

• Sequencing: The order in which the operations are performed.
• Iteration: Repeating a set of operations, typically using loops (e.g., for, while).
• Selection: Making decisions in code, typically done with conditional statements (e.g., if, else).

If you needed to add iteration or selection to this code, here’s a simple example:

Adding Iteration (Using a loop)

for i in range(3):  # Repeat the greeting 3 times
    firstname = input("What is your firstname? ")
    lastname = input("What is your lastname? ")
    print("Hello " + firstname + " " + lastname + "!")

Adding Selection (Using an if statement)

firstname = input("What is your firstname? ")
lastname = input("What is your lastname? ")
if firstname and lastname:  # Check if both names are provided
    print("Hello " + firstname + " " + lastname + "!")
else:
    print("You didn't provide both your first name and last name.")

In summary, your original code primarily demonstrates sequencing. Adding loops or conditional statements would introduce iteration and selection, respectively.