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: ['3839', 'z', 'y', 'T', 'v', 'w', '2469', '2651', '499', '7407', 'O', 'Q', 'e']

3839, 26, 25, 20, 22, 23, 2469, 2651, 499, 7407, 15, 17, 5