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:
['e', '1251', 'y', '6689', '6389', 'h', 't', '503', '5093', 'e', '923', '7051', 'm', 'u', '4501', '3289', '6887', '8341', 'o', '3671', 'n', 'w', '7749', 's', 'j', 'o', '8429', 'q', 'v', 'p', 'd', 'g', 'i', 'f']

Ex Output:
d, e, f, g, h, i, j, m, n, o, p, q, s, t, u, v, w, y


Ex Input:
['h', 'l', 'i', '1507', 'h', '409', '6777', 'u', '5563', '6113', '6513', '9949', '461', 'z', 'm', '2519', 'r', '4699', 'n', 'x', '4645']

Ex Output:
h, i, l, m, n, r, u, x, z


Ex Input:
['x', '219', 'l', '3589', '3145', '835', 'z', '9139', '1149', 'y', 'g', '355', '8407', 'w', '7783', 'l', 'n', 'd', '1043', '5341', 'b', 'e', '3479', '9313', '9233', 'g', 's', '9', '5005', 'l', '665', '4203', '8987', 'b', '7191', 'q', 'y', '5803', '9911']

Ex Output:

b, d, e, g, l, n, q, s, w, x, y, z