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.

['6655', '7445', '1795', '7495', 'h', 'z', 'u', '2199', 'r', 'p', '2245']
h, p, r, u, z

['d', '1989', '6365', 'y', 'm', '1245', '7539', 'm', '3787', '6987', 'e', 'e', 'y', '9577', 'b', '5', '8179', 'x', '2853', '6337', 'w', 'f', 'b', 'q', '563', '6077', '1133', 'x', '6045']
b, d, e, f, m, q, w, x, y

['4455', '3609', 'x', 'u', '5087', 'd', '7299', '5133', 'q', 'j', 'u', '2489', '6905', '6499', 'k', '4035', 'b', 'z', '3981', '8921', '7007', 's', 'd', 'h', '101', 'a', 'n', '1561', 'm', '3421', '8057', 'm', '1913', '3287', 'j', 'v', 'w', 'a', 'r', 'y', '909', 'u', '4331', 'i', 'v']

a, b, d, h, i, j, k, m, n, q, r, s, u, v, w, x, y, z