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.

['3651', 'c', 'm', '7123', '2981', '9649', 'o', '2181', 'h', '8577', 'a', '5027', 'x', 'u', '1039', '347', '8219', 'c', '1063', '8885', 'f', 'd', '3067', '2509', 'i', 's', '5509', '2003', 'h', '8869', 'x', 'd', '5141', 'h', 'i', 'b', 'o']
a, b, c, d, f, h, i, m, o, s, u, x

['9579', 'm', 'v', 'r']
m, r, v

['f', '1279', 'q', 'n', '6925', '4979', 'n', 'j', '8069', 'q', 'h', 'f', 'b', 'u', 'z', 'q', '7741', '6521', '3557', '5949', 'w', 'p', '3789', '9995', '973', '1215', '6461', 'a', 'j', 'h', 'd', '4791', '5603', 'h', 'p', 'k', '9791', 's', '4333', 'u', 'u', '4455', 'y']

a, b, d, f, h, j, k, n, p, q, s, u, w, y, z