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: ['u', 'i', '1185', '3795', '5417', 'k', 'b', '2629', '2635', 'z']

Output: b, i, k, u, z


Input: Consider Input: ['1627', 'r', '2429', 'b', '4451', 's', 'k', 'm', '269', 'l', '709', 's', 'q', '985', 'x', 'j', 'k', 'k', '6603', 'v', '9497', '477', '5803', 'c', 't', 'f', '3189', '6419', '8561', '5709', 'u', 'z', '5717', '9711', 'w', 'y', 'm', 'v']

Output: b, c, f, j, k, l, m, q, r, s, t, u, v, w, x, y, z


Input: Consider Input: ['g', '4989', 'r', '9015', '7819', 'h', '4601', '9985', 'k', '1351', 's', 'r', 'w', '9547', 's', '7919', 'x', '5583', '9869', 'i', 'w', '3749', '8719', 'o', 'j']


Output: g, h, i, j, k, o, r, s, w, x