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: ['b', 'y', '2013', '5323', '889', '6257', '8113', '6951', '9563', '8935', '6437', 'S', '5973', '2609', '2855', 'J', 'Z', '629', '7687', '8481', '2673', 'B', 'S']

2, 25, 2013, 5323, 889, 6257, 8113, 6951, 9563, 8935, 6437, 19, 5973, 2609, 2855, 10, 26, 629, 7687, 8481, 2673, 2, 19