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.

Example Input: ['w', '491', 'x', 'u', 'z', 'q', '5411', '7629', '8261', '8629', '1441', '5139', 's', 'm', '6463', 'u', 'z']
Example Output: m, q, s, u, w, x, z

Example Input: ['1063', 'f', 'm', 'i', 'x', 'i', 'd']
Example Output: d, f, i, m, x

Example Input: ['t', '8777', '6937', '9837', 'a', '5831', 'f', '6425', '7367', 's', '4223', 't', 'l', '5', '5573', 'h', '5907', '6829', '8271', '6763', 'o', 'a', '4493', '6699']
Example Output:
a, f, h, l, o, s, t