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: ['d', '5285', 'z', 't', 'i', '719', 'z', 'b', '3603', '4781', 'o', 'g', 'j', 'd', 'r', 'a', 'x', '5829', '4907', '7395', '993', '2109', '1745', '415', '7525', '1029', '7791', '5321', 'h', '6391', 'g', '4613', '9191', 'o', '7365', '1811', '9695', 'w']

A: a, b, d, g, h, i, j, o, r, t, w, x, z
****
Q: ['8975', '7199']

A: -1
****
Q: ['7687', 'd', '9137', 'm', '1583', 'c', '4587', '4099', 's', 'q', '8611', '2265', 'n', '7885', 'o', '279', '8281', '1235', 'n', '8445', '7653', 'm', '5873', '945', 't', '4245', 'c', '2401', '1189', '1565', '3589', '6475', '1007', '2569', '6625', '3951', '3871']

A:
c, d, m, n, o, q, s, t
****