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: ['4743', '9687', '2887', '4413', 'r', 'w', '2355', 'l', 'd', '453', 'o', 'm', '4351', '5881', '3963', 'g', 'r', 'z', 'q', '7555', 'y', '9555', '405', 'n', 'l', '6733', '1763', 'v', '9925', 'y', '633', '827', 'w']

A: d, g, l, m, n, o, q, r, v, w, y, z
****
Q: ['8315', 'b', '4333', 'f', '6507', '6211', '3475', 'c', 'e', '8039', '661']

A: b, c, e, f
****
Q: ['w', '8425', 'c', 'l', 'j', '8221', 'g', '4395', '2145', '7909', '7501', '5885', '6725', '2575', 'd', '579', 'w', '5979', '6373', '7523', '5613', 's', 'i', '5891', 'n', '6197', 'k', '3231', 'u', '5779', 'b', 'o', '8111', 'o', '8719']

A:
b, c, d, g, i, j, k, l, n, o, s, u, w
****