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: ['h', '1797', '8211', 'n', 'r', '7707', '2063', '4655', 'x', '5521', '8327', 'g', '7659', 'i', 'x', 'w', '9465', '4625', 'q', '5377', 'r', '225', 'r', 'i', 'e', '4163', 'g', 'g', '3537', 's']

Output: e, g, h, i, n, q, r, s, w, x


Input: Consider Input: ['f', 'a', 'r', '4009', 'k', 'a', 'g', '7725', 'v', 'b', '6705', 'a', '6583', '3159', 'c', 'w', 'x', 'h', '7625', 'p', 'y', '5645', 'k', 'r', 'j', '4175', 'r', '3103', '8631', '5999', 'p', 'g', 'h']

Output: a, b, c, f, g, h, j, k, p, r, v, w, x, y


Input: Consider Input: ['4519', '6841', 'o', 'w', 'h', '899', '3967', 'x', 'b', '3177', '1131', '9629', 'n', '63', '3855', '1327', 'o', '9313', '5165', '3295', 'f', 'm', '147', 'e', 'g', 'q', 'z', '5659', '3749', 's']


Output: b, e, f, g, h, m, n, o, q, s, w, x, z