Problem
Write a function called get_nth ( S'tr'_list, n), which takes in two parameters, st r'_list, which is a list of words (strings), and n, which is an integer.
The function should return a string that is composed of the nth letter in the nth word in the list, repeated n times.
Note that when we say "nth letter"/ "nth string" in this case, we are counting starting at l, for example 's' is the 4th letter in 'prismatic', even though it is index 3 because Python starts counting at 0. You can assume n will be a positive integer, and that the list will have its nth string have at least 11 letters.