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: ['k', 'j', 'v', '5277', '8607', 'n', '1109', 'e', 'k', '6579', 'o', '2909', 'u', 't', '9685', '8443', '9257', '8071', 'y', 'b', 'h', '4767', 'a', 'j', '8455', 'b', '7733', '2553', 'e']
Example Output: a, b, e, h, j, k, n, o, t, u, v, y

Example Input: ['p', 'f', 'h', '1977', '6221', 'i', 'a', 'l', '5225', '8059', 'c', 'w']
Example Output: a, c, f, h, i, l, p, w

Example Input: ['5969', '7721', 'k', 'z', '4793', '9879', 'd', 'c', 'e', '6245', '8201', 'b', 'c', 'u', '7987', 'w', 'j', '8861', '2779', 'v', '7721', '5481', 'x', '6217']
Example Output:
b, c, d, e, j, k, u, v, w, x, z