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: ['997', '3843', '5991', '5415', 'U', 'V', '619', '9381', 'a', 'o', '9493', 'M', 'E', 'g', '9989', '9243']

SOLUTION: 997, 3843, 5991, 5415, 21, 22, 619, 9381, 1, 15, 9493, 13, 5, 7, 9989, 9243

PROBLEM: ['U', '7017', 'w', 'Z', 'T', 'X', '8699', 'S', 'R']

SOLUTION: 21, 7017, 23, 26, 20, 24, 8699, 19, 18

PROBLEM: ['J', 'Y', '1305', 'n', 'J', '4533', 'r', '6587', 'Y', '8961', 'a', 'Z']

SOLUTION:
10, 25, 1305, 14, 10, 4533, 18, 6587, 25, 8961, 1, 26