1. Write a function getString (n) to return a string composed of n uppercase or lowercase letters (6 points) 2. Write a function distinct Sort(list) to remove the duplicate elements of an array list, and then make it descending order. For example, the array [0.4.2.3.4.4.0.2] is distinct to become [0,4,2,3] and [4,3,2,0] after sorting (6 points)