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: ['p', '2923', 'e', 'k', '5433', '605', '5079', 'k', 'p', 'x', '4845', '4099', '6795']

Output: e, k, p, x


Input: Consider Input: ['y', 'm', 'q', '2569', '5047', 'w', 'g', '2131', 'e', 'q', '4161', '6563', 'u', '1603', 'k', '8587', '3773', '9173', '67', '4335', 'q', '675', 'o']


Output: e, g, k, m, o, q, u, w, y