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.

['9113', '3625', 'u', '8189', '3649', '259', '5539', '1583', 'g', '4037', 'y', 'v', '8337', 'd', 'q', 'j', 'c', 'h', 'p', '1601', 'z', 'c', 'n', '1767', '1679', '1805', 'm', '4469', '2487', '6015', '973']
c, d, g, h, j, m, n, p, q, u, v, y, z

['3035', 'f', 'k', 'e', '3023', 'p', '9667', '5277', '4757', '8433', 'g', '1399', '7721', 'n', 'p', '7469', '7581', '5679', 'g', 'q']
e, f, g, k, n, p, q

['6893', 'f', 'r', '8625', '623', '2739', 'u', '5521', '237', 'p', '4313', 'x', 'h', 'o', 'f', 'g', 'j', 'j', 'y', '279', 'e', 'c', '6509', '3017', 'w', '8735', '2175', 'g']

c, e, f, g, h, j, o, p, r, u, w, x, y