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

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

PROBLEM: ['y', 'M', 'X', '6399', '8383', '4459']

SOLUTION: 25, 13, 24, 6399, 8383, 4459

PROBLEM: ['U', '1115', 'P', 'Z', '4495', 'c', 'u', 'k', 'f', '2671', '415', 'b', 'b', '9351', 'b', 'j', '7971']

SOLUTION:
21, 1115, 16, 26, 4495, 3, 21, 11, 6, 2671, 415, 2, 2, 9351, 2, 10, 7971