Definition: In this task, you are given an input list A comprising of numbers and alphabets. You need to extract and sort the unique alphabets in the list. The alphabets in the input list will only be in lowercase. Return -1 if there is no alphabet in the input list.
Input: ['v', 'j', 't', '3343', 'z', 'w', '2137', 'l', '2711', '1427', '9211', '8311', '9715', '8347', '9183', 't', 'j', '4083', '3347', '9075', 'c', '9857', '9923', '9599', 'o', 't', 'u', '6039', '4845', '7835', 'c', 'l', '3089', 'm', 'b', 'p', 'f', '6935', '6663', '8609', 'c', '1949', '9257', '6855']
Output:
b, c, f, j, l, m, o, p, t, u, v, w, z