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: ['7065', 'q', 't', '3177', '9035', 'i', 'l', 'd', '8961', '1183', '6507', 'u', 'c', 't', '2467', '7659', 'e', '8963', 'j', 'g', 'p', '6779', '7115']

Output: c, d, e, g, i, j, l, p, q, t, u


Input: Consider Input: ['t', 'h', '6141', 'g', 'f', 'z', 'n', 'b', 'k', '9059', 'y', 'p', '4289', '2683', 'a', '3267', 'w', 'p', 't', '3623', '7759', 'a', 'o', 'm', '9815', 'q', 'u', '8051', '6871']

Output: a, b, f, g, h, k, m, n, o, p, q, t, u, w, y, z


Input: Consider Input: ['h', '8169', '333', 'y', '2105', 's', 's', '5057', '1315', '3675', '9273', 'r', 'h', '9083', 'k', '3507', 'w', 's', 'x', 't', '6531', 'e', 'p', 's', 'f', 'n', '9349', 'h', 'c', 'l', '8001', 'y', 'k', 'p', 'm', 't', 'd', '97', '6127', 'c', 'z', '1309', 'd']


Output: c, d, e, f, h, k, l, m, n, p, r, s, t, w, x, y, z