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.

[EX Q]: ['8051', 'h', 'g', 's', 't', 'p', 'w', 'x', 's', '8521', 'm', '9719', 'j', 'n', 'i']
[EX A]: g, h, i, j, m, n, p, s, t, w, x

[EX Q]: ['5181', '8651', '963', '2111', 'g', '7913', '8335', 'o', '1387', '9225', '6517', 's', 'r', '2291', '3699', 'y', 'y', '4223', 'i', '9109', 'm', 's', '8585', 'l']
[EX A]: g, i, l, m, o, r, s, y

[EX Q]: ['1995', 'e', '9349', '2581', 'o', 'j', 'r', 'u', '1445', '687', 'a', 'n', '2025', '3357', 'w', '6451', '969', 'r', '5869', '7769', 's', 'r', '835', 'c', 'f', 'k', '4417', '8255', '5299', 'v', '4417', '4169', '9543', 'i', 's', '9127', 'j', '7977', 'i']
[EX A]:
a, c, e, f, i, j, k, n, o, r, s, u, v, w