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: ['1289', '6909', '607', 'O', 'a', '5851', 'y', '5699', '7337', 'f', 'g', '6459', '6777', '5019', '3273', 'C', 'P', 'X', '6295', '3353', 'w', '889', 'n', 'Q', '4455', '8377', '2531', 'T', 'P', '7877', '1729', 'F', 'X', '8027', '15', 'E', '3409', '1747']

1289, 6909, 607, 15, 1, 5851, 25, 5699, 7337, 6, 7, 6459, 6777, 5019, 3273, 3, 16, 24, 6295, 3353, 23, 889, 14, 17, 4455, 8377, 2531, 20, 16, 7877, 1729, 6, 24, 8027, 15, 5, 3409, 1747