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: ['3117', 'i', 'd', '7537', 'i', 'q', '4649', '7263', '3655', 'd', 'x', '8569', 'g', '2389', '3933', '7099', '563', '3055', '9941', 'm', 'c', '3529', '3577', 'x', 's', 's', '6153', '1731', '9679', 'f', '8839', '5183', '5', '6433']

A: c, d, f, g, i, m, q, s, x
****
Q: ['5163', 'n', 'j', '67', '3801', 'n', '7113', 'z', '579', '6885', '8921', 'v', '5481', '5507', 'k', '8403', 'c', '837', 'u', '6341', 'd', 'i', '497']

A: c, d, i, j, k, n, u, v, z
****
Q: ['g', '7137', 'p', '2501', 'g', '1443', 'j', 'p', 'i', 'w', '3057', 'j', '6885', '7803', 'm', 'j', '3359', 'k', '8487', '5707', 'n', '923']

A:
g, i, j, k, m, n, p, w
****