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: ['f', 'X', 'X', '7117', '1739', '7629', 's', 'd', 'I', 'Q', 'O', '5497', 'u', '623', 'd', 'U', '5019', 'i', 'Y', '7757', 'J', '121', 'I', 'D', '9307', 'O', 'R', '6109', 'T', '1389', '4983', 'U', '4895', '1131', '7387']

6, 24, 24, 7117, 1739, 7629, 19, 4, 9, 17, 15, 5497, 21, 623, 4, 21, 5019, 9, 25, 7757, 10, 121, 9, 4, 9307, 15, 18, 6109, 20, 1389, 4983, 21, 4895, 1131, 7387