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: ['6411', 'x', 'i', '267', 'z', 'e', '5483', '8033', '3697', 'z', '4167', 'e', 'f', '7229', 'i', 't', '2197', 'g']

Output: e, f, g, i, t, x, z


Input: Consider Input: ['1653', '3177', 'b', '2785', '2515', 'd', '5513', '5599', '2947', 'v', '2771', '5697', '2913', '4161', '5939', '2655', '6787', '9851', 'q', '3199', 'x', '1305', '9423', '9117', '4821', 'j', '7963', 'i', 's', '469', 'r', 'w']

Output: b, d, i, j, q, r, s, v, w, x


Input: Consider Input: ['1785', '2911', '3361', 'e', 'g', '8667', '4061', '8701', 'm', 'd', '8871', '9725', '6125', '6181', '8621', '8709', 'n', '251', '9187', '5823', '5961', '4393', 'c', 'e', 'x', '943', '9091', '6131', '7027']


Output: c, d, e, g, m, n, x