Here is a problem i have with my python coding class could you help me solve it and explain how it was done?:

If the input is $1,2,$ or $3,$ the program works as in the first example, except it calculates and displays

sum, multiple or difference depending on what was chosen. After that, it will display the menu again.

Enter a number: $3$

Enter another number: $12$

The numbers $3$ and $12$ were entered.

The multiple of the numbers is $36.$

$1.$ Calculate the sum

$2.$ Calculate the difference

$3.$ Calculate multiples

$4.$ Exit the program

Choose an option: $4$

If the input is $4,$ the program stops execution.

If something else is entered, the menu is displayed again.

The program therefore continues execution until the input to the menu is $4.$

Try to duplicate the program text as little as possible. If exactly the same program lines occur

more than once, check if it can be skipped.

FYI the first excersise is this:

Write a program that asks the user to enter two numbers, first one, then the other.

Enter a number: $3$

Enter another number: $12$

Next, the program writes out what the numbers were in one continuous sentence.

The numbers $3$ and $12$ were entered.

Finally, the program says what the multiple of the numbers is$.$

The multiple of the numbers is $36.$