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: ['a', '2261', '583', '1579', 'W', 'H', '8413', '3851', '4891', '9901', 'V', '8607', 'D', 'M', '3825', 'L', 'w', 'S', '9335', 'O', '1921', 'B', 'f', '6345', '2723', '5541', 'd', '9355', 'l']

1, 2261, 583, 1579, 23, 8, 8413, 3851, 4891, 9901, 22, 8607, 4, 13, 3825, 12, 23, 19, 9335, 15, 1921, 2, 6, 6345, 2723, 5541, 4, 9355, 12