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.

['5973', 'h', '4081', 'i', '8059', 'w', 'j', '6175', 'w', '8685', '5811', 'k', 'n', '5577', '9817', 'v', '8617', 'u', 'y', '3921', 'b', '1027', '5405', 'a', '3501', '6659', 's', 'e', '157']
a, b, e, h, i, j, k, n, s, u, v, w, y

['t', 'h', '6141', 'g', 'f', 'z', 'n', 'b', 'k', '9059', 'y', 'p', '4289', '2683', 'a', '3267', 'w', 'p', 't', '3623', '7759', 'a', 'o', 'm', '9815', 'q', 'u', '8051', '6871']
a, b, f, g, h, k, m, n, o, p, q, t, u, w, y, z

['2963', 'h', '8001', 'g', '2345', 'z', '927', 'm', 'd', 'z', '7503', '797', 'f', 'd', 'g', '761', '817']

d, f, g, h, m, z