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: ['8859', '575', 'l', 'e', '6575', '1303', '8643', '1395', '3171']
Example Output: e, l

Example Input: ['l', '1213', 'm', 'k', '7825', '3501', '2397', '2313', 'v', '4119', 'h', 't', '6137', 'l', '9851', 'q', '9661', 'b', 'z', '1437', '1759', 'l', '611', '5085', '4443', 'n', 'u', 'b', '2511', '6023', '7157', 'n', '9921', 'o', 'a', 'o', 'w', 't', 'o', '1607', '6751', 'n', 'b']
Example Output: a, b, h, k, l, m, n, o, q, t, u, v, w, z

Example Input: ['2239', 'p', 'x', 'd', 'f', 's', '4409', 'v', '2667', '1561', 'd', '3961', '7169', 'd', 'l', '1805', '5191', 'm', '6247', '375', '2371', 'p', '5341', '4265', 's', '2277', '2903', '7691', 'f', 'g']
Example Output:
d, f, g, l, m, p, s, v, x