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: ['6933', 'i', 'C', '7619', '5375', '2257', '8861', '2571', 'c', 'l', '4923', '9933', 'H', '3049']

6933, 9, 3, 7619, 5375, 2257, 8861, 2571, 3, 12, 4923, 9933, 8, 3049