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.

['7123', 'm', 'h', '4065', 'c', 'n', '187', '3899', 'r', 'k', '2071', '9481', '6277']
c, h, k, m, n, r

['7839', '849', '5651', '4275', 'e', '5453', 'h', '2099', '485', 'i', 'm', 'n', '6563', '5675', '4001', 'h', 'm', 'z', '3467', '4237', '5035', '5609', '8475', '5171', 'v', '3883', '8461', '8611', '4853', 'd']
d, e, h, i, m, n, v, z

['c', '9953', '1029', '8523', 'u', 'd', 'b', 'n', 'i', 'k', '7955', '8071', '5575', 'x', '1855', '7763', '5353', '9939', '5377', 'l', 'z', 'e', 'k', '2845', '8601', 'v', '8813', 'u', '2357', '1481', 't', '1219']

b, c, d, e, i, k, l, n, t, u, v, x, z