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.

Example Input: ['3117', 'i', 'd', '7537', 'i', 'q', '4649', '7263', '3655', 'd', 'x', '8569', 'g', '2389', '3933', '7099', '563', '3055', '9941', 'm', 'c', '3529', '3577', 'x', 's', 's', '6153', '1731', '9679', 'f', '8839', '5183', '5', '6433']
Example Output: c, d, f, g, i, m, q, s, x

Example Input: ['2521', '8027', 'm', '193', '615', 'l', '1947', '5949', '6307', 'r', '1015', '743', 'v', '6949', 'b', 'g', '8841', 'c', 'b', '2879']
Example Output: b, c, g, l, m, r, v

Example Input: ['z', '8377', '7011', '3469', 'm', '6083', 'o', '9505', '5023', '3111', 'v', '1123', 'y', 'm', '911', 'y', 'o', 'd', 'b', '4137', 'b', 'f', '3667', 'b', 'k', 'x', 'j', 'z', 'p', '5185']
Example Output:
b, d, f, j, k, m, o, p, v, x, y, z