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:
['d', '5285', 'z', 't', 'i', '719', 'z', 'b', '3603', '4781', 'o', 'g', 'j', 'd', 'r', 'a', 'x', '5829', '4907', '7395', '993', '2109', '1745', '415', '7525', '1029', '7791', '5321', 'h', '6391', 'g', '4613', '9191', 'o', '7365', '1811', '9695', 'w']

Ex Output:
a, b, d, g, h, i, j, o, r, t, w, x, z


Ex Input:
['1801', 'q', '5101', '8863', '2309', 'p', '8789', '9529', '6135', '5523', 'f', '8889', '7639', 'k', '263', '5751', '5529', 'g', '1451', '4143', 'e', '6987']

Ex Output:
e, f, g, k, p, q


Ex Input:
['749', '8153', '6563', '4113', 'f', 'p', '6169', 's', '6489', 'j', '6119', '2731', 'u', 'f', '9119', '3625', '9801', 'r', 'w', '2823', 'j', 'k', 'q', 'q', 'x', '573', 's', '431', '3377', 't', 'q', 'w', 'k', '255']

Ex Output:

f, j, k, p, q, r, s, t, u, w, x