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: ['5463', '5683', 'w', '4071', '3997', 'i', '9677', 'q', 'l', 'v', 'w', '5325', '197', 'g', 'g', '3227', '3477']

Output: g, i, l, q, v, w


Input: Consider Input: ['e', 't', 'k', 'm', '9183', 'g', '7731', '9269', '9675', 'd', 'x', '3477', '95', '3787', '553', 't', '8385', 'z', '6505', 'y', 'd', 'z', '107', 'b', 'i', '4797', 'u', 'u', 'b', 'z', '57', 'h', 'w', '7179', 'f', 'q', '3349', '403', 'i', 'v', 's']


Output: b, d, e, f, g, h, i, k, m, q, s, t, u, v, w, x, y, z