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: ['7109', '1243', 'f', 'z', 'h', 'd', '6169', 'v', 'h', '3609', '3181', 'd', '3661', '7193', '7341', '9127', 'r', '1623', '5813', 's', 'd', '4011', '4983', 'n', '4195']
Example Output: d, f, h, n, r, s, v, z

Example Input: ['o', '9599']
Example Output: o

Example Input: ['9657', 's', '537', 'j', '3513', 'z', 'q', '187', 'm', 'o', 'v', '4157', 'w', 'n', '227', '3527', '3745', 't', 'i', '7689', '9355', 'f', 'd', '5581', '3039', '4121', '2141', '2491', '3731', 'f', 'p', 'k']
Example Output:
d, f, i, j, k, m, n, o, p, q, s, t, v, w, z