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.

['t', 'c', 'r', '4459', 'o', '1407', 'x', '1515', '331', 'm', '1535', 'p', 'u', 'g', '2513', 'o', '7827', '8149', 'd', 'z', 'q', '5655', 'x', '9997', '2809', 'g', 'h', '6309', 'a', 'j', '9773', '2115', 't', '9113', 'q', 'o', '427', 's', '3815', '5423', 's', 'n', 'i', 'o', '3643']
a, c, d, g, h, i, j, m, n, o, p, q, r, s, t, u, x, z

['7561', 'r', '3419', 'k', 's', '5997', 'u', '6635', '7003', '8491', 'i', '9835', 'c', '8827', 'h', 'a', 'j', '7675', '1995', '1223']
a, c, h, i, j, k, r, s, u

['4867', 'q', '2311', 'f', 'o', '2009', 'm', '8357', '4405', '9745', 'g', 'w', '1207', 'f', '169', '3799', '1287', '2293', '6529', 'n', 'i', '9413', '7875', '7411', 'x', '6671', 'h', '3289', 'w']

f, g, h, i, m, n, o, q, w, x