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: ['v', '3765', '4065', 'a', '4201', 'f', 'x', '9275', 'q', '9303']

A: a, f, q, v, x
****
Q: ['8821', '9833', 'l']

A: l
****
Q: ['3213', '8409', '2993', 'p', 'i', '45', '3275', '5633', 'u', '7557', 'v', '5499', '1739', 'f', 'i', '8675', 'v', 'w', 'u', '4259', 'g', '349', 'e', 'w', 'm', '3981', 'w', 't', '4353', '6753', '7053', '3083', '8815', 'g', 'f', 's', 'j']

A:
e, f, g, i, j, m, p, s, t, u, v, w
****