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: ['d', '771', '4193', 'e', '1537', 'a', 'q']

Output: a, d, e, q


Input: Consider Input: ['z', '2519', '4799', '4715', '7165', 'r', 'r', 'l', 'n', '6925', '8935', '9795', '5489', 'v', 'u', '6527', '2241', 'u', 'c', 'w', '9755', 'w', '9823', 'g']

Output: c, g, l, n, r, u, v, w, z


Input: Consider Input: ['5481', '4261', '9947', '6617', 'd', 'm', '9419', '9611', 'm', '925', '1015', 'a', 'l', '5321', '7065', '1003', '9629', '7397', 'k', 'k', 'w', 's', 'm', '4557', 'm', 'd', 'l', '3603', '8839', 'e', '6539', '4227', '9089', 'y', '175']


Output: a, d, e, k, l, m, s, w, y