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: ['c', '9125', '6049', '5201', 'v', '9311', 'q', '3305', 'l', 'q', '3387', '3647', 'x', '471', 'a', '5631', 't', '9679', '5423', '2569', 'w', 't', '6397', 'e', 'h', 'c', 'v', 'v']

Output: a, c, e, h, l, q, t, v, w, x


Input: Consider Input: ['c', '8785', 'u', 'i', 'i', '6513', '6093', 'w', 'i', 'x', '9377', 'p', '1545', '7997', 'a', 'c', '125', 'u', '9149', '9103', 'u', 'o', 'h', '2275', '8503', '3251', 'c', '9925', 'w', '6873', 'c', 'h', 'e', '2369', 'c', 'z', '1337', '9541', '675', 's']

Output: a, c, e, h, i, o, p, s, u, w, x, z


Input: Consider Input: ['7697', 'h', 'c', 'k', '5717', '9567', 'c', '5367', 'c', '8075', 'w', 'b', '2975', 'q', 'n', '7889', 'h', '137', '7473', '2603', '8259', '6585', '3543', '8253', 'w', '245', 'f', '3067', 'm', 'o', 'e', '2561', '3035', 'e', 'd', '1043', '7359', '7823', 'u', '2635', '5161', '4573', '1367', '6651']


Output: b, c, d, e, f, h, k, m, n, o, q, u, w