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.

[Q]: ['4041', 'l', 'g', '9571', '9295', '1395', 'l', 'p', 'f', 'w', 'g', '1721', '2421', 'w', 'z', '2235', 'p', '7851']
[A]: f, g, l, p, w, z


[Q]: ['k', '6595', '1595', 'v', 'h', 'b', '8815', '6681', 'j', '7581', 'p', '9095', '5453', 'r', 'y', '7755', 'x', '1853', 'k', 'q', 'u', 'j', 'q', '9651', 'o']
[A]: b, h, j, k, o, p, q, r, u, v, x, y


[Q]: ['7159', '7895', '4839', '1959', 'b', '5507', 'o', '7469', 'n', 'e', 'x', '3339', '473', 'c', 'q', '55', '8201', '4371', 'd', 'i', '4077', '9821', '5299', '1869', 's', '5209', 'o', '999', 'q', '3683', '2975', '329', 'i']
[A]:
b, c, d, e, i, n, o, q, s, x