So the first line is correct.
The second line (or lines) needs to take the person variable that you just created and figure out the first middle and last characters. Strings of text, like a name 'Jeremy' can be sliced, meaning that if you add bracets ( [ or ] ) after a string (or its variable) you can select a character in that position.
So if person = 'Jeremy' and you execute the code 'person[0]' you'll get 'J', or the 0th element in the string (computers start counting at 0!)
person[0] is the first letter.
slicing the -1st element gives you the last letter of a string
person[-1] is the last letter.
What about the middle? You could do len(person) to find its length and divide by 2, then pass that into the slice (The int() function just removes the decimal place in case there's an odd number of digits:
middle_element = int(len(person) / 2))
person[middle_element]
Let me know if you have any questions, I wrote this kind of hastily.
edit:
For your input line, why not do something like 'person = input('> ')
This way, you're prompting the user to enter something and it's not just a black line
You could also do 'person = input('Enter your name:\n> ')
The '\n' represents a newline, so the '> ' will be on the next line.