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: ['z', '8629', 'c', '1843', '3499', 'z', 'y', '5503', 'g', 'M', 'e', 'o', '2191', '9843', '9763', '7175', '9943', 'y', '3937', '8273']

26, 8629, 3, 1843, 3499, 26, 25, 5503, 7, 13, 5, 15, 2191, 9843, 9763, 7175, 9943, 25, 3937, 8273