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: ['565', '6701', 'P', 'Z', 's', '6915', '7931', '1403', '8957', '8999', 'K', 'p', 'M', 'f', '3551', '9433', 'j', '8891', '883', '7883', '8595', '7429', 'w', '4289', '5903']

SOLUTION: 565, 6701, 16, 26, 19, 6915, 7931, 1403, 8957, 8999, 11, 16, 13, 6, 3551, 9433, 10, 8891, 883, 7883, 8595, 7429, 23, 4289, 5903

PROBLEM: ['5481', 'W', '1285', 'U', '6155', '1505', 'Z']

SOLUTION: 5481, 23, 1285, 21, 6155, 1505, 26

PROBLEM: ['2959', '501', '8985', '8809', '8263', '2285', '8459', 'X', '5167', 'B', '9117', 'Z', '5693', '1117', 'Y', 'L', 'l', '6207']

SOLUTION:
2959, 501, 8985, 8809, 8263, 2285, 8459, 24, 5167, 2, 9117, 26, 5693, 1117, 25, 12, 12, 6207