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.

Example Input: ['2915', '6033', '5541', '4685', '1263', '6701', 's', '7269', 'g', '8033', '8171', '6917', 'l', '2913', '447', 'g', 'a', 'z', 'o', '7563', '5385', '5259', '5067', '4869', '2653', '6925', '7001', '8553', 'x', '1243', '9131', '5037']
Example Output: a, g, l, o, s, x, z

Example Input: ['u', 'k', 'd', '4393', 'u', 'h', 'q', '833', 'k', 'l', '5749', 'r', '7123', '1003', 'z', '531', 'o', 'u', '6601', '6975', '4905', 'n', 'e']
Example Output: d, e, h, k, l, n, o, q, r, u, z

Example Input: ['6063', 'y', 'e', 'g', '3799', 's', '1783', 'h', 'w', 't', 'f', '7509', '8953', 'm', 'u', '3451', 'y', '4997', '2903', '55', '4341', 'f', '4213', 's', 'j', '1371', '7693', 's']
Example Output:
e, f, g, h, j, m, s, t, u, w, y