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.

['u', '1343', 'd', 'c', '9567', 'e', 'd', 'y', 's', '4199', '3217', '2937', '9345', 'd', 'l', '9875', '5987', 'p', '2585', '5843', '9643', '2423', 'e', 'l', 's', '3503', 'b', 'w', '9685', 'p', '6055', 'k', 'e', 'e', 't', '865', '6071', 'j', '3439', 't']
b, c, d, e, j, k, l, p, s, t, u, w, y

['2459', '3709', 'f', '8673', '9313', 'm', 'd', 'g', 'c', 'g', 'u', 'f', 'p', 'i', '8771', '3613', '9669', '6221', '1211', '8331', '2295', 'b', 'f', 'm', '1377', '9831', '1751', 'k', '4831', 'm', '2747', '3435', '4543', 'c', '1729', 'e', '7093', '397', 'm', '383', '2019']
b, c, d, e, f, g, i, k, m, p, u

['k', 'w', 'n', '8121', 'k', '3989', '1109', '7995', '8723', '8869', '9343', '6671', '8771', 'v', 'u', '2929', 'y', '3149', '5281', 'v', '2931', '5255', '2083', 'j', 'o', '7125', 'j', 'x', '9969', '2225', '595', '3461', 'u', '8683', 'h', 'f', '7993', '8411']

f, h, j, k, n, o, u, v, w, x, y