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: ['t', 'h', '6141', 'g', 'f', 'z', 'n', 'b', 'k', '9059', 'y', 'p', '4289', '2683', 'a', '3267', 'w', 'p', 't', '3623', '7759', 'a', 'o', 'm', '9815', 'q', 'u', '8051', '6871']

Output: a, b, f, g, h, k, m, n, o, p, q, t, u, w, y, z


Input: Consider Input: ['a', 'y', 'v', 'f', 'x', 'k', 'f', 'j', '6245', '6289', 'd', '6909', '8701', 'm', '3277', 'f', 'j', 'j', '9227', '8663', '5771', 'j', 'n', 'u', '7837', 's', '2539', '6363', 'g', 'a', '1009', 'v', '1483', 'x', 'i']

Output: a, d, f, g, i, j, k, m, n, s, u, v, x, y


Input: Consider Input: ['1205', '2343', 's', 'z', 'j', '955', '6553', 'b', 'x', '7391', '3345', '5455', 's', '3585', '2527', 'f', '4867', 'y', 'm', 'm', 'e', '8575', '2507', 't', 'o', 'a', '6301', '7451', 'w', '4645', 'm', 'u', 'q']


Output: a, b, e, f, j, m, o, q, s, t, u, w, x, y, z