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: ['g', 'u', 'q', '1375', '9491', 't', 'w', 'c', 'v', 'y', '3169', '1607']

Output: c, g, q, t, u, v, w, y


Input: Consider Input: ['g', 'x', 'l', 'e', 'd', '1345', '1763', 'm', 'c', '2057', 's', 'a', '4127', 'y', 'h', '8581', 'o', '9203', '4761', 'd', 'u', 'n']

Output: a, c, d, e, g, h, l, m, n, o, s, u, x, y


Input: Consider Input: ['b', '5037', '6935', 'u', 'f', '1125', 'r', '5695', '9629', '5693', '3355', '8353', '1217', 'o', 'j', 'b', '2535', 'a', 'q', '2607', '6257', 'c', '7883', 'f', 'j', 'p', 'k', '9833', '4391', 'f', '9139', 'x', 'b', '7575', '4051']


Output: a, b, c, f, j, k, o, p, q, r, u, x