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: ['803', 'C', '1075', '2357', 'I', '2909', 'j', '1975', '217', '2789', 'd', 'M', 'a', 'Y', 'S', '7901', '5375', 'f', 'C', 'k', '1681', '5793', '6413', 'T', '6495', '425', '6255', '3683', '7537', '2823', 'L']

803, 3, 1075, 2357, 9, 2909, 10, 1975, 217, 2789, 4, 13, 1, 25, 19, 7901, 5375, 6, 3, 11, 1681, 5793, 6413, 20, 6495, 425, 6255, 3683, 7537, 2823, 12