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: Consider Input: ['f', 't', '2135', '8397', '6361', '389', '2253', 'x', 'p', '4833', '5785', 'x', '1811', '9639', '5739', '175', '3231', '5931', 'r', 'c', 'g', 'h', 'p', '909', 'p', '587', 'a', 'a', 'h', 'q', 's', '5945', '4911', 't', 'h', '7517', 'p', '3177', 'h', 'u', '3577', '7055', 'l']

Output: a, c, f, g, h, l, p, q, r, s, t, u, x


Input: Consider Input: ['k', 'j', 'v', '5277', '8607', 'n', '1109', 'e', 'k', '6579', 'o', '2909', 'u', 't', '9685', '8443', '9257', '8071', 'y', 'b', 'h', '4767', 'a', 'j', '8455', 'b', '7733', '2553', 'e']

Output: a, b, e, h, j, k, n, o, t, u, v, y


Input: Consider Input: ['l', '4103', 'e', '8071', 'o', 'u', 'j', 'c', '5971', '8291', '5209', 'e', '2395', '9303', 'b', '4045', '1793', '1811', '8559', 'w', '2539', 'i', '9963', '1519', 's', '3921', '4481', '8883', '2363', '2435', 'a', '3923', 'a']


Output: a, b, c, e, i, j, l, o, s, u, w