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: ['o', '4769', 'J', '8717', 'E', '7265', 'W', 'X', '6751', 'v', '5429', 'T', 's', '5497', '6323', 'M', '1719', 'G', '2655', 'T', 'X', 'Q', 'Z', '8513', 'W', 'c', 'S']

15, 4769, 10, 8717, 5, 7265, 23, 24, 6751, 22, 5429, 20, 19, 5497, 6323, 13, 1719, 7, 2655, 20, 24, 17, 26, 8513, 23, 3, 19