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: ['5433', '4011', '2113', '2299', 'e', '9829', 'd', 'q', 'e', '3921', 'a', 'q', '8953', 'q', 'g', 'w', 'z', 'u', '4425', 'b', 'q', '5315', 'b', 'u', 'h', 'y', '9733', 'b', 'c', '1225', 'a']

Output: a, b, c, d, e, g, h, q, u, w, y, z


Input: Consider Input: ['u', '4731', 'l', 'p', '1997', '601', 'n', 'l', 'p', '211', '7355', '6537', 'w', 'x', '1741', '8145', '3689', 'm', 'y', '6945']

Output: l, m, n, p, u, w, x, y


Input: Consider Input: ['69', 'b', '5779', 'l', '4877', 'u', 'y', '3443', 'n', 'q', '6509', '573', 'u', '4197', 'g', 'u', '1175', 'i', '495', '9281', 'n', '7787', '9553', 'h', 'g', 'e', 'm', '949', 'w', 'a', 'p', 'g', '3593', '3781']


Output: a, b, e, g, h, i, l, m, n, p, q, u, w, y