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: ['N', '7581', '3319', 'W', 'i', '8975', 'd', 'H', 'u', 'B', 'J', '9119', 'Q', 'Y', '7247', '1021', 'E', '7993', 'w', '8067', 'u']

14, 7581, 3319, 23, 9, 8975, 4, 8, 21, 2, 10, 9119, 17, 25, 7247, 1021, 5, 7993, 23, 8067, 21