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: ['9961', '5427', 'H', '6493', 'S', 'D', 'W', 'a', 'i', 'H', '723', '4707', '8901', 'w', 's', 'N', '7831', '7273', '8967', '4749']

9961, 5427, 8, 6493, 19, 4, 23, 1, 9, 8, 723, 4707, 8901, 23, 19, 14, 7831, 7273, 8967, 4749