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: ['r', 'n', '7583', '8697', '7927', 'l', '5003', '1363', 'p', 'e', 'q', '6227', '6915', '8619', '9011', 'n', '3063', '3799']
Example Output: e, l, n, p, q, r

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: ['8023', '283', 't', 's', '9553', '1889', 'r', '3897', 'u', 'f', '7809', '6139', 'm', '2855', '3279', 'i', '9979', 'q', 'y', '6437', '7169', '843', 'm', '6719', 'u', '9167', '5809', 'b', 'q', 's', '6043', '8695', '8451', 'o', '405', '2873', 'z', '919', 'j', 'd', '71', 'r', '9185', 'f', 'u']
Example Output:
b, d, f, i, j, m, o, q, r, s, t, u, y, z