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: ['V', '3989', 'Y', '7445', '9447', 'i', 'N', 'J', 's', 'C', 'M', 'K', 'D', '6821', 'W', 'z', 'Q', '3707', 'B', 'H', 'L', 'V', 'Q', '763']

22, 3989, 25, 7445, 9447, 9, 14, 10, 19, 3, 13, 11, 4, 6821, 23, 26, 17, 3707, 2, 8, 12, 22, 17, 763