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:
['w', 'o', 'l', '5331', 'k', '9325', '6759', '7931', '8185', 'w', 'h', 'h', 'x', '4357', '6845', 'v', 'o', '8401', 'u', 'g', 'f', 'j', 'j', '2493', '4753', 'c', 'm', '1469', '4307', 'm', '2737', 'n', 'y']

Ex Output:
c, f, g, h, j, k, l, m, n, o, u, v, w, x, y


Ex Input:
['d', 'a', '6931', 'c', 'u', 'z', '9713', 'v', 'm', 'e', 'k', 'o', '9705', 'a', '5373', 'c', '2983', '8097', 'h', '3039', 'g', 'f', 'n', 'v', '853', '8227', '7573', 'j', 'h', 'k', 'o', 'k', '8897', 'd', 'g', 'd', 'd', '4039']

Ex Output:
a, c, d, e, f, g, h, j, k, m, n, o, u, v, z


Ex Input:
['u', 'v', '9521', '5411', 'l', 'o', '2545', '8805', '8423', '5083', 's', '6665', 'j', '5423', 't', '869', '2885', '9347', 'c', '4733', 'd', '1083', 'u', '4393', 'c', 'c', 's', 's', 'g', 'n', 'p', 't', 'j', '6319', '1631', '4555', '433', 'j', 'x', 'u', 'v', 'q', '1409', 'r', '841']

Ex Output:

c, d, g, j, l, n, o, p, q, r, s, t, u, v, x