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: ['j', 'p', '8333', '8079', '4703', '7089', '8859', 'b', 'y', 'g', '7971', '6999', '2011', 'k', 'e', '9609', '4179', '3993', 'u', '3957', '6313', '4229', 'k', '5963', 'e', 'y', 'r', 'e', 'a', '2213', 'e', 'i', 'f', '7979', 'r', 'a', 'h', 'e', 'n']

Output: a, b, e, f, g, h, i, j, k, n, p, r, u, y


Input: Consider Input: ['6737', 'g', '9985', '5257', 'k', 't', '7863', 'y', '8319', 'l', 'o', '6505', '6531', 'z', '3055', '2943', '3625', 'h', '4867']

Output: g, h, k, l, o, t, y, z


Input: Consider Input: ['d', '7869', 't', '7259', '8815', '5861', '4955', '1703', '1647', 'o', '6773', '2039', '4719', '6947', 'c', 'h', 'p', 'a', '2009', '4749', 'q', '6977', '5625', 'c']


Output: a, c, d, h, o, p, q, t