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: ['8451', 'x', '9965', '9303', 'm', 'f', '4205', 'y', 'n', '8521', '9995', 'z', 's', '3519', 'k', 'e', 'o', 'k', '9611', 'q', 'l', 'p', '3339', '4023', 'n', 'd', '8903', 'a', 'k', 'u', '4009', 'e', 'm', '989', '4495']

A: a, d, e, f, k, l, m, n, o, p, q, s, u, x, y, z
****
Q: ['7799', '8163', '3389', 'x', 'k', 'm', '6085', 'f', '1131']

A: f, k, m, x
****
Q: ['5029', '1267', '4033', 'd', '187', '3861', '7747', 'z', 'o', 'g', '4009', '1501', 'q', 'p', '2633', '1769', '9553', '5501', 'y', 'q', '1057', 'a', '6639', '4407', '4533', '891', 's', '2007', 'h', '2419', '5431', 'c', '9773', '7601', 'u', 'a', 'k', '4671', 'v', '7477']

A:
a, c, d, g, h, k, o, p, q, s, u, v, y, z
****