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: ['O', '6049', '4915', '1573', '719', '2061', 'O', 'n', '6689', 'J', '4985', 'r', 'q', '6617', 'k', '2333', '183', '4549', '6053', '1075', '737', '6465', '5421']

SOLUTION: 15, 6049, 4915, 1573, 719, 2061, 15, 14, 6689, 10, 4985, 18, 17, 6617, 11, 2333, 183, 4549, 6053, 1075, 737, 6465, 5421

PROBLEM: ['9093', 'T', '7465', '8911', 'U', 'd', 't', '9501', 'l', 'M', '1917', '1899', '7739']

SOLUTION: 9093, 20, 7465, 8911, 21, 4, 20, 9501, 12, 13, 1917, 1899, 7739

PROBLEM: ['G', 'j', '2009', '4983', 'J', 'q', 'T', '3633', '991', 'J', 'E', 'S', '5749', 'l', '8279', '4777', '8697', 'c', 'g', '903', 'r', '8995', '5901', '4571', 't', 'x', 'D', '4659']

SOLUTION:
7, 10, 2009, 4983, 10, 17, 20, 3633, 991, 10, 5, 19, 5749, 12, 8279, 4777, 8697, 3, 7, 903, 18, 8995, 5901, 4571, 20, 24, 4, 4659