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: ['S', '8943', 'Z', 'o', 'k', '547', '4989', 'z', 'M', '9765']

19, 8943, 26, 15, 11, 547, 4989, 26, 13, 9765