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: ['9003', 'i', '881', 'l', 'f', '2663', '1619', 'Y', 'E', 'W', '2869', 'k', 'v', 'c', '9423', 'S', 'G', 'C', 's', '4311', '531', '9789', '937', 'F']

SOLUTION: 9003, 9, 881, 12, 6, 2663, 1619, 25, 5, 23, 2869, 11, 22, 3, 9423, 19, 7, 3, 19, 4311, 531, 9789, 937, 6

PROBLEM: ['7565', 'c', '4849', '6873', '6901', 'Q', '4237']

SOLUTION: 7565, 3, 4849, 6873, 6901, 17, 4237

PROBLEM: ['2559', 's', '9887', 'c', '1459', '3937', 'z', 'D', 'A', 'k', 'I', '6239', 'U', '7029', 'B', '5279', '4435', '4285', '9007', '9987', '747', 'O', '2675', '1019', 'K', 'r']

SOLUTION:
2559, 19, 9887, 3, 1459, 3937, 26, 4, 1, 11, 9, 6239, 21, 7029, 2, 5279, 4435, 4285, 9007, 9987, 747, 15, 2675, 1019, 11, 18