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.

Ex Input:
['f', '3409', 'i', '4147', '1745', '6007', 'l', 'd', 'i']

Ex Output:
d, f, i, l


Ex Input:
['6737', 'g', '9985', '5257', 'k', 't', '7863', 'y', '8319', 'l', 'o', '6505', '6531', 'z', '3055', '2943', '3625', 'h', '4867']

Ex Output:
g, h, k, l, o, t, y, z


Ex Input:
['j', '7851', 'l', '3061', '3975', '2299', '9389', '5503', 'u', 'd', 'n', '4501', 'q', '7783', '673', 'l', 'y', 'd', 'o', '471', '211', 'm', 'd', 'v', '4939', '2183', 'h', '3219', 'w', 'j', '2371', 'v']

Ex Output:

d, h, j, l, m, n, o, q, u, v, w, y