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: ['4993', '6641', '3127', '9409', '8453', '5909', '6109', 'y', 'f', '6859', 'c', '3863', 't', '1221', '3689', 'w', 'h', '7947', 't', '5979', 'l', 'i', '1321', '3149', 'l', 'v', '3825', 'z', '9297', 'f', 'e', '7205', 'a', 'a', '2645', '391', '4965', 'w', 'h', '7715', '9409', '3603', '4147']

A: a, c, e, f, h, i, l, t, v, w, y, z
****
Q: ['8281', '4831', '1329', 'g', 'e', '8879', 'n', 's', 'x', 'j', '6305', 'j', '921', '3677', '5107', 'n', 'j', '9285', 'a', '5329', '6671', 'c', '9283', 'l', 'a', '7907', 'q', '7605', '855', '6477']

A: a, c, e, g, j, l, n, q, s, x
****
Q: ['9677', '7459', 's', '7017', '7115', '6953', 'r', '4779', '8567', 's', '6801', '5995', '1765', '2709', 'm', 'y', 'a', '8201', '1121', '107', 'l', '873', '371', 'a', 'w', '8217', '9299', 'p', '9673', 'u', '2231']

A:
a, l, m, p, r, s, u, w, y
****