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: ['6513', '9497', '8963', 'E']

SOLUTION: 6513, 9497, 8963, 5

PROBLEM: ['z', 'f', '5867', '3475', 'A', '4535', 'm', 'S', '1189', '3275', '3249', 'a', 'K', '2015', 'W', '6543', 'O', 'K', 'E', 'C', 'O', '5889', '6795', 'M', 'A', 'p', '4315', '9367', 'i', '5781', '875', '7125', 'i', 'H', '4399', '3707', '7141', 'E', 'z']

SOLUTION: 26, 6, 5867, 3475, 1, 4535, 13, 19, 1189, 3275, 3249, 1, 11, 2015, 23, 6543, 15, 11, 5, 3, 15, 5889, 6795, 13, 1, 16, 4315, 9367, 9, 5781, 875, 7125, 9, 8, 4399, 3707, 7141, 5, 26

PROBLEM: ['1749', 'U', '2249', 'C', '3911', '5909', '421', '7017', 'x', '7129', '1751', '2221', 'K', '4205', '2393', '4297', 'q', '1459', '4599', '6133', 'r', '6037', 'V', 't', '4677', '7483', '1491', 'd', 's', '4033', '4693', '559', 'Z', '563', 'V', 'J', 'E', '2057', '5161']

SOLUTION:
1749, 21, 2249, 3, 3911, 5909, 421, 7017, 24, 7129, 1751, 2221, 11, 4205, 2393, 4297, 17, 1459, 4599, 6133, 18, 6037, 22, 20, 4677, 7483, 1491, 4, 19, 4033, 4693, 559, 26, 563, 22, 10, 5, 2057, 5161