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: ['S', 'H', '1293', 'x', '2649', '6253', 'd', '4981', 's', '6377', 'E', '7663', 's', 'x', '8737', '5535', 'X', '2099', '7723', '7827', '351', 'e', 'm', '6933', '6921', 'B', '3045', 'v', '3967', '2353']

19, 8, 1293, 24, 2649, 6253, 4, 4981, 19, 6377, 5, 7663, 19, 24, 8737, 5535, 24, 2099, 7723, 7827, 351, 5, 13, 6933, 6921, 2, 3045, 22, 3967, 2353