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: ['2581', 'X', '3249', '753', '5639']

SOLUTION: 2581, 24, 3249, 753, 5639

PROBLEM: ['g', 'k', '4871', 'w', 'y', 'D', 'R', 'X', '5989', '5509', 'R', 'r', '6921', '5449', '3033', 'u', '1237', '5847', '583', 'L', '5649', 'l', 'V', '1763']

SOLUTION: 7, 11, 4871, 23, 25, 4, 18, 24, 5989, 5509, 18, 18, 6921, 5449, 3033, 21, 1237, 5847, 583, 12, 5649, 12, 22, 1763

PROBLEM: ['1493', '6123', '9599', 'i', 'r', '4879', '1949', '1397', 'S', 'm', 'H', 'N']

SOLUTION:
1493, 6123, 9599, 9, 18, 4879, 1949, 1397, 19, 13, 8, 14