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: ['6849', 'H', '7327', '4535', '9729', 'H', 'N', '1519', 'e', '2431', '323', '4083', 'w', '7429', 'y', 'A', '2981', 'y', '5969', 'W', 'H']

6849, 8, 7327, 4535, 9729, 8, 14, 1519, 5, 2431, 323, 4083, 23, 7429, 25, 1, 2981, 25, 5969, 23, 8