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.

Input: Consider Input: ['2741', '2541', '8943', 'l', '4047', '2211', 'p', 'e', 't', '7645', '9771', 'f', '5063', '2303', '6097', '5089', 'd', 'e', '1409', '3125', '2171', 'g', '1247', '4045', 'v', 'h', 'u', '2587', '5207', '5553', 'g', 'd', '6891', 'e', '2471', '2435']

Output: d, e, f, g, h, l, p, t, u, v


Input: Consider Input: ['9783', '3185', '8225', 'u', '1123', 'd', '3453', 'i', '7713', '8457', '8609', 'h', '2767', 'e', '7191', '2929', '1089', '393', 'e', 'd', '11', '9329', '683', '1271']

Output: d, e, h, i, u


Input: Consider Input: ['l', '2469', '4205', '9995', '8575', 'r', '611', '3651', '8259', '1357', '5365', 'h', '4483', '7607', 'i', 'l', '925', 't', 'w', '5035', 'a', '5309', 'c', '1601', 'v', 'k', 'f', '8783', '835', 'n', 'w', 'm', '6175', '199', '4177', '229', '8545', 'c', 't']


Output: a, c, f, h, i, k, l, m, n, r, t, v, w