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.

Q: ['5463', '5683', 'w', '4071', '3997', 'i', '9677', 'q', 'l', 'v', 'w', '5325', '197', 'g', 'g', '3227', '3477']

A: g, i, l, q, v, w
****
Q: ['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']

A: b, c, d, e, f, g, i, k, m, p, u
****
Q: ['w', '3395', 't', 'j', 'v', 'j', 'h', '8777', '9919', '9965', 'v', '1851', '3607', '9949', 'y', '2205', '2047', 'o']

A:
h, j, o, t, v, w, y
****