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: ['395', '8309', 'v', 'r', 'x', 'j', 'l', 'b', 'c', 'c', '3123', 't', 'a']

Output: a, b, c, j, l, r, t, v, x


Input: Consider Input: ['e', 'k', '7569', '6387', '4593', '2445', '345', '2905', 'h', '3119', '7001', 'x', 'a', '2943', '3635', 'l', 'q', 'z', 'g', '2657', '7849', 'i', '9413', 'm', 'e', '2951', 'd', '2963', 'b', 'u', 't', 'i', '1141', 'c', 'm', '8607', 's']

Output: a, b, c, d, e, g, h, i, k, l, m, q, s, t, u, x, z


Input: Consider Input: ['v', 'e', '7621', 'e', 'a', '7109', 'a', '389', '3435', 's', 'f', '6393', '1065', '7681', 't', '5629', '5855', '7685', 'e', '1503', 'w', 'r', '6809', '2509', 't', 'h', '1351', 'w', '8349', 'f', '2223', 'k', '1623', 'x', 'm', 'l', '3917', '2619', '2245', 'w', '9729', 'm', 'j']


Output: a, e, f, h, j, k, l, m, r, s, t, v, w, x