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.

Ex Input:
['1223', 'h', 'a', 'o', 'v', '2535', 'g', '6267', 'w', '9625', '7961', '9577', '7611', '5655', 'p', 'j', 's', '2141', '4101', 'l', '4367', '9383', 'n', '5965', '9097', '7571', 'p', 'u', 'x']

Ex Output:
a, g, h, j, l, n, o, p, s, u, v, w, x


Ex Input:
['m', '5005', 'y', 'h', 'w', '3609', 'p', '2539', '3307', 'p']

Ex Output:
h, m, p, w, y


Ex Input:
['4397', 'h', '8647', '469', '5723', 's', 'd', '9479', '4871', 'z', 'b', '7191', '1143', '3619']

Ex Output:

b, d, h, s, z