Definition: In this task, you are given an input list A. You need to convert all the alphabets in the list with a number representing their position in the English alphabet. E.g., replace A by 1, B by 2, a by 1, b by 2, and so on.
Input: ['8647', '1159', '2981', 'R', 'o', 'k', 'd', 'S', 'K', '6661', '6813', 'M', 'l', 'y', 'a', 'x', 'D', 'n', 'H', 'w', '7003', 'n', 'a', '1191', 'z', 'W', '2707', '4633']

8647, 1159, 2981, 18, 15, 11, 4, 19, 11, 6661, 6813, 13, 12, 25, 1, 24, 4, 14, 8, 23, 7003, 14, 1, 1191, 26, 23, 2707, 4633