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]: ['z', '5601', '5675', 'w', 's', 'z', '9213', '9563', '1699', 'p', 'g', 'm', 'c', '9279', '4481', 'p', 'n', '2389', 'c', '503', '1901', '8827', '1701', '1607', '5633', 'a', 'z', 'g', '3175', 's', 'l', 'l', '6811', '1821', '693', '8277', 'q', '8623', 'o']
[EX A]: a, c, g, l, m, n, o, p, q, s, w, z

[EX Q]: ['j', 'a', 'z', 'h', '4129', '4159', 'm', 'o', 'o', '1193', '2905', '3083', 'q', 't', 'm', 'o', '673', '7547', 'n', 'c', 'r', 't', '2897', '4959', 'z', '2377', 'y', '7977', 'u', 'b', 's', 'w', 'e', 'd', '8051']
[EX A]: a, b, c, d, e, h, j, m, n, o, q, r, s, t, u, w, y, z

[EX Q]: ['k', '8115', '5915', '8063', 'a', '9289', '9553', '2675', 's', '8303', '8061', '6791', 'h', '2717', '3851', '3521', 'f', '9839', '7425', '3557', '3285', 'i', 'k', '9455']
[EX A]:
a, f, h, i, k, s