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.

['i', 'h', '8299', 'e', 'c', '5543', '5241', 'f', '3985', 'f', 'z', '1245', 'e', 't', 'g', '5199', '9217', 'q', 'j', 'p', '767', 'z', '1803', 'k', '7303', '3187', '2507', '6471', '3337', '6037', '9291', 'a', 'l']
a, c, e, f, g, h, i, j, k, l, p, q, t, z

['t', 'h', '6141', 'g', 'f', 'z', 'n', 'b', 'k', '9059', 'y', 'p', '4289', '2683', 'a', '3267', 'w', 'p', 't', '3623', '7759', 'a', 'o', 'm', '9815', 'q', 'u', '8051', '6871']
a, b, f, g, h, k, m, n, o, p, q, t, u, w, y, z

['u', 'q', 'h', '3039', '8937', '4487', '8045', 'w', 'e', '8771', 'g', '9427', 'h', '4465', '1049', '6505', 'w', 'o', '1037', '8083', '1113', '8203', 'p', '2065', 'n', '775', '7157']

e, g, h, n, o, p, q, u, w