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: ['8555', '5421', 'm', '7921', '5905', 'J', 'c', '8729', 'S', '425', '9859', 'C', '8129', '4105', '9961', 'J', '3211', 'm', 'f', '5541', '1255', '6323', 'm', '557', 'F', '9725', '1063', '2259', 'F', 'W', '1065', '2823', 't', '2023']

8555, 5421, 13, 7921, 5905, 10, 3, 8729, 19, 425, 9859, 3, 8129, 4105, 9961, 10, 3211, 13, 6, 5541, 1255, 6323, 13, 557, 6, 9725, 1063, 2259, 6, 23, 1065, 2823, 20, 2023