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: ['T', '5037', '8839', 'u', 'O', '9879', 'V', 'N', 'W', '4181', 'C', '3863', 's', 'H', 'X', 'X', '6483', '7607', 'q', 'E', 'f', 'r']

20, 5037, 8839, 21, 15, 9879, 22, 14, 23, 4181, 3, 3863, 19, 8, 24, 24, 6483, 7607, 17, 5, 6, 18