The number that is not a number
A programme that only ever works on marks typed into the file is not much use. You want to ask the person at the keyboard. Python does that with input() — it prints a prompt, waits for someone to type, and hands back whatever they typed.
And there is the trap. Whatever they typed comes back as text, always. Type 72 and you get the two characters 7 and 2, not the number seventy-two. Text cannot be added to, averaged or plotted. Ask Python to add 5 to it and the programme stops.
str for text, int for whole numbers, float for numbers with a decimal point. Ask what something is with type(x), and Python answers with a line like <class 'str'>.int("72") builds the whole number 72 out of that text. float("7.5") builds 7.5. str(72) goes the other way. The conversion has to succeed: int("abc") has nothing to build a number from, and stops the programme.What you are building
A programme that asks for marks, shows the type of what came back, converts it to a whole number, shows the type again so the change is visible, adds 5 grace marks and prints the result. Typing 72 should give:
Arrange the steps
Six things have to happen. Two are already in place — the note at the top and the question to the person at the keyboard. Click the remaining four in an order that works.
You are trying to make a change visible. That means looking before as well as after.
Your plan
The steps still to place
Fill the statements
Your steps written as Python. Three pieces are missing, and two of them decide whether the addition works at all.
Leave nothing on "choose…". A wrong pick does not always cause an error — sometimes it just prints something you did not expect, which is the harder kind of mistake to spot.
Run and read
Here is the whole programme. Instead of typing at a real prompt, put what the person types into the box below.