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.

['7711', 'l', 'i', '1545', 'j', 'x', '6697', '9411', 'p', '2733', 'l', '2631', '1313', 'g', '2459', '1085', 's', 'n', 'x', '3565', '3695', 'q', '6767', 'f', '4251', 'n', 'e', '8515', 'v', '1259', 'd', '2653', '7055', '7391', '9257', 'e', '8585', '8981', 'w', '4449', '773']
d, e, f, g, i, j, l, n, p, q, s, v, w, x