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: ['3561', 'd', '9697', 'd', '7761', 'a', '2833', 'c', '2921', 't', '691', 'g', '4797', 'b', '3913', 'f', 'q', '7807', 'j', '3577', 'j', '1775', '2897', '2589', '993', '8595']

Output: a, b, c, d, f, g, j, q, t


Input: Consider Input: ['8301', 'd', 'p', 'l', 'm', '9099', 'o', '8045', 'e', 's', 't', '8853', 'v', '6375', 'q', '2505', 's', '4219', '3587', 'g', '651', '7129']

Output: d, e, g, l, m, o, p, q, s, t, v


Input: Consider Input: ['6645', 'n', '8283', 'g', 'f', 'j', '2327', '3867', '5849', 'z', 'y', '29', '901', 's', '7741', '5855', 'x', 'o', 'o', '8305', '7709', 'p', 'd', '5855', '1725', '8115', 'f', 'e', '163', '4359']


Output: d, e, f, g, j, n, o, p, s, x, y, z