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.

['1801', 'q', '5101', '8863', '2309', 'p', '8789', '9529', '6135', '5523', 'f', '8889', '7639', 'k', '263', '5751', '5529', 'g', '1451', '4143', 'e', '6987']
e, f, g, k, p, q

['9425', 'l', 'c', 'n', '5925', '2543', '3935', 'c', '7533', 'j', 'q', '3775', '5897', '9435', '69', 'e']
c, e, j, l, n, q

['6525', '5561', 'p', 'n', '8853', '3687', '7507', 'q', '2041', '5929', '27', '7943', 'v', 'i', 'q', '1193', 'o', '3699', '2371', '6395', 'k', '6753', '5753', 's', 'g', '1399', '3339', '6917', 'u', '3623', 'x', 's', 't', 'j', 'v', 's', '5261', 'h', '7971', 'q', '517', 'l', '451', '3041']

g, h, i, j, k, l, n, o, p, q, s, t, u, v, x