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: ['i', '9215', 'n', 'p', '4815', '8757', 'm', '1755', 'c', 'z']
Example Output: c, i, m, n, p, z

Example Input: ['o', '4169', 'k', '7349', 'w', 't', '8271', '8781', '3725', '2865', '6053', 'j', 'z', '4211', '8231', '213', '6389', 'f', 'h', 'g', '9269', '4617', '4137', 'i', 'y', 'i', 'n', '4597', 'p', 'z', '3195', '3231', 'c', '1901', '1231', 'p', '4509', '2557', '3715']
Example Output: c, f, g, h, i, j, k, n, o, p, t, w, y, z

Example Input: ['6453', '7875', 'z', '2691', 'y', 'm', '8057', '2307', 'b', 'm', '3783', 'd', '5505', 'i', 'b', 'k', '8425', 'h', '4977', '9657', '1091', 'v', '1493', '3917', '3639', '531', '6093', '9407', '4525', '7173']
Example Output:
b, d, h, i, k, m, v, y, z