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: ['6279', '5001', '777', '8979', '9677', 'U', '4657', '3253', '3759', '9481', 'm', 'H', '3625', '3821', 'L', '501', 'e', '1913', 'r', '2625', 'b', '3541', '2417', '3863']

6279, 5001, 777, 8979, 9677, 21, 4657, 3253, 3759, 9481, 13, 8, 3625, 3821, 12, 501, 5, 1913, 18, 2625, 2, 3541, 2417, 3863