Write a function, add, that takes two numbers and returns their sum.

Write a function, sub, that takes two numbers and returns the first minus the second.

Write a function, that takes a word and two integers, word, n and e, and returns characters of word from n - e to n + e (including both). Example:

>>> middle("robertdeniro", 2, 1)
obe
>>> middle("robertdeniro", 3, 2)
obert

Restrictions:
  - You cannot use + or -
  - The body of of the function should have only one line

Define a function that takes a string and an integer, word and n, and returns character of word with index n + 1.

Write a function, add, that takes two numbers and returns their sum.

Write a function, that takes a word and an integer, word and n, and returns the first n + 3 characters of word. Example:

>>> get_substring('gegnisht', 0)
geg
>>> get_substring('tosknisht', 2)
toskn

Restrictions:
  - You cannot use + or -
  - The body of of the function should have only one line

Write a function the takes one string and returns its last character. You should use len function as part of the index expression.

Define a function has_common_letters(word1, word2) that returns True if the two words share at least one common letter, False otherwise.

Given the above script, what are the results of the following expressions:

Given the above script, what are the results of the following expressions:

Complete execution flow of the following program

Which line runs next? Click it!

Complete execution flow of the following program

Which line runs next? Click it!