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.

['h', 'u', 'y', '7677', '9441', '1769', 'v', '1433', 'l', '7739', 'a', '8305', 'n', 'a', '6711', '3161', 'e', 'u', '993', '2211', '4011', 'q', 'o']
a, e, h, l, n, o, q, u, v, y

['m', '7807', 'n', 'w', '5097', '1023', '2723', 'u', '3055', '7285', 'f', 'm', 'w', '5197', '9743', '7519', '4451', 'c', 't', '1939', '5847']
c, f, m, n, t, u, w

['1085', 'c', '9507', 'u', 'g', '5251', 'k', '7689', 'j', 'u', 'u', 'r', '4695', 'f', 'n', 'd', '935', '1889', 'u', '1671', '9531', '309', '4381', 'w', 'd', '613', '6805', 't', '1711', '3599', '8429', '1285', '1685', '2085', 'z', '5375', 'e', 'n']

c, d, e, f, g, j, k, n, r, t, u, w, z