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: ['E', 'j', 'A', '4081', '2835', '5711', 'u', '6247', '2919', '8497', '2797', '2537', 'i', 'E', '3683', 'C', '4831', '255', '345', '2907', 'b', '6205', '4773', 'i', '897']

5, 10, 1, 4081, 2835, 5711, 21, 6247, 2919, 8497, 2797, 2537, 9, 5, 3683, 3, 4831, 255, 345, 2907, 2, 6205, 4773, 9, 897