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: ['6573', '5519']

SOLUTION: 6573, 5519

PROBLEM: ['b', 'u', 'r', '3453', '1663', 'b', '651', 'R', 'U', 'U', 'a', 'b', '2769', 'C']

SOLUTION: 2, 21, 18, 3453, 1663, 2, 651, 18, 21, 21, 1, 2, 2769, 3

PROBLEM: ['t', '8525', 'W', 's', 'q', '263', '4781', '8933', 'V', 'c', 'Q', '7603', '2703', 'n', '1865', '9691', 'T', '2645', 'G', 'z', 'T', '6467', '7861', 'U']

SOLUTION:
20, 8525, 23, 19, 17, 263, 4781, 8933, 22, 3, 17, 7603, 2703, 14, 1865, 9691, 20, 2645, 7, 26, 20, 6467, 7861, 21