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:
['i', 'i', 'h', 'g', '5123', 'i', 'r', '3183', 'w', 'g', 's', '9777', '455', 'l', 'r', 'h', 'e', 's', 'v', '6823', '463', '9603', 'e', '947', '7071', 'c', '3373', 'j', 'w', 'm', 's', 's', '3483', '9567']

Ex Output:
c, e, g, h, i, j, l, m, r, s, v, w


Ex Input:
['l', 'i']

Ex Output:
i, l


Ex Input:
['h', 'b', 'k', 'e', 'b', 'r', '5099', 'f', 'z', '2927', '5329', 'o', '5551', '265', 't', 'c', '5797', '5787', '6011', '3691', '9505', 'l', '67', 'p', 'm', 'b', '9769', '463', '3201', '7879', 'b']

Ex Output:

b, c, e, f, h, k, l, m, o, p, r, t, z