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: ['r', 's', '3409', 'a', 'e', '6855', 'i', 'n', '8655', 's', 't', '8401', 'u', '9603', '8815', 'q', 'a', 'x', 'i', '8455', 'e', '5877', '3917', 'p']

Output: a, e, i, n, p, q, r, s, t, u, x


Input: Consider Input: ['491', '229', 'g', '6677', '4793', 'h', 'x', 'a', '2333', 'u', 'l', '785', 'p', '7331', '653', '5193', '5415', '8417', 'v']

Output: a, g, h, l, p, u, v, x


Input: Consider Input: ['765', 'i', '5663', '1101', '9947', '8493', '2707', '5557', '573', '2049', 'z', 'm', 'y', 'j', '6499', 'l', 'z', 'q', 'x', 'm', 'z', '5413', 't', 'g', '5083', 'g', 'k', 'm', '5395', 'q', '5131', '2359', 'j', '6403']


Output: g, i, j, k, l, m, q, t, x, y, z