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: ['n', '9127', 'k', '9641', 'h', '6137', 's', 'E', 'N', 'D', 's', 'Y', '9669', 'Z', 'c', '3553', '2105', '4519', '1969', '1545', 'f', 'v', '4571', 'S', 'O', 'd', 'r', 'I', 'I', '2105']

SOLUTION: 14, 9127, 11, 9641, 8, 6137, 19, 5, 14, 4, 19, 25, 9669, 26, 3, 3553, 2105, 4519, 1969, 1545, 6, 22, 4571, 19, 15, 4, 18, 9, 9, 2105

PROBLEM: ['99', 'A', 'r', '3627', 'U', '297']

SOLUTION:
99, 1, 18, 3627, 21, 297