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.

['y', 'u', 'c', '5909', 'x', '9865', 'e', 'h', '5125', '4719', 'w', '8855', 'i', 'd']
c, d, e, h, i, u, w, x, y

['6737', 'g', '9985', '5257', 'k', 't', '7863', 'y', '8319', 'l', 'o', '6505', '6531', 'z', '3055', '2943', '3625', 'h', '4867']
g, h, k, l, o, t, y, z

['3295', '4591', '4143', '1037', '8921', '3193', 'o', 'h', 'm', '9075', '6505', 'r', 'h', 'u', 'z', '6101', '7845', 'i', 'e', 's', 't', '2711', '3473', '7097']

e, h, i, m, o, r, s, t, u, z