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: ['2973', 'a', '6251', 's', '5009', 'm', 'G']

SOLUTION: 2973, 1, 6251, 19, 5009, 13, 7

PROBLEM: ['n', '1835', '6523', '6879', '1757', 'N', '2327']

SOLUTION: 14, 1835, 6523, 6879, 1757, 14, 2327

PROBLEM: ['6683', 'm', '4967', 'I', 'x', 'q', '9507', 'G', 'R', '9235', 'g', 'L', 'b', 'D', 'W', '9391', 'Q', 'R', '7739', 'e', 'E', '8201', '1273', 'W', '673', '8617']

SOLUTION:
6683, 13, 4967, 9, 24, 17, 9507, 7, 18, 9235, 7, 12, 2, 4, 23, 9391, 17, 18, 7739, 5, 5, 8201, 1273, 23, 673, 8617