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:
['l', '1213', 'm', 'k', '7825', '3501', '2397', '2313', 'v', '4119', 'h', 't', '6137', 'l', '9851', 'q', '9661', 'b', 'z', '1437', '1759', 'l', '611', '5085', '4443', 'n', 'u', 'b', '2511', '6023', '7157', 'n', '9921', 'o', 'a', 'o', 'w', 't', 'o', '1607', '6751', 'n', 'b']

Ex Output:
a, b, h, k, l, m, n, o, q, t, u, v, w, z


Ex Input:
['8051', 'h', 'g', 's', 't', 'p', 'w', 'x', 's', '8521', 'm', '9719', 'j', 'n', 'i']

Ex Output:
g, h, i, j, m, n, p, s, t, w, x


Ex Input:
['317', '4947', '1783', 'w', '2699', '6407', 'o', '9809', 'a', 'j', '5709', 'e', 'x', 'a', 'm', '9593', '9921', 'd', '103', '1513', '3281', 'z', 'g', 'v', '1953', 'o', 'y', '2877', 'z', 'n', '8409', '6193', 'd', 'g', '8651', 'v', 'h', '8017', '2391', 'b', 'm', 'f', '6749']

Ex Output:

a, b, d, e, f, g, h, j, m, n, o, v, w, x, y, z