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: ['o', 'z', 'h', '3965', 'n', '3009', '173', '997', '3987', '5799', '2331', 'p', 'x', '897', '8213', '451', 'u', 't', 't', '9917', '4501', 't', 'c', 'i', 'w', 'w', 'u', '2977', 't', 'b', '4161', '9281', 'w', 'f', '3137', '5745', 'e', '673', '6363', 'h', 'q', 'x', 'm', '9505']

Output: b, c, e, f, h, i, m, n, o, p, q, t, u, w, x, z


Input: Consider Input: ['9351', 'v', 'h', 'z', 'g', 'f', 't', 'q', 'g', 'o', '4073', 'n', '6149', '1735', '157', 'm']

Output: f, g, h, m, n, o, q, t, v, z


Input: Consider Input: ['441', '7933', 'v', 'g', '1051', 'y', '3527', 'h', '8755', '7195', 'o', '4509', 'd', 't', 't', '6865', '5501', '3447', '8065', '73', '4053', 'z', '8583', 'k']


Output: d, g, h, k, o, t, v, y, z