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: ['6521', 'f', 'm', '1051', 'w', 'C', 'H', 'X', '7715', '5243', '3365', 'l', 'X', 'J', 'y', 'U', '4367', 'v', '8399', '1731', 'z']

SOLUTION: 6521, 6, 13, 1051, 23, 3, 8, 24, 7715, 5243, 3365, 12, 24, 10, 25, 21, 4367, 22, 8399, 1731, 26

PROBLEM: ['2609', '8593', 'X', '365', '8173', '1859', '4371', 'M', '7949', 'O', 'D']

SOLUTION: 2609, 8593, 24, 365, 8173, 1859, 4371, 13, 7949, 15, 4

PROBLEM: ['G', 'x', 'M', '8309', 'V', 'f', 'I', 'M', 'F', '1127', '1365', 'J', '3463', 'F', 'l', '5063', 'p', 'C', '7857', '8683', '7205', 'N', '9143']

SOLUTION:
7, 24, 13, 8309, 22, 6, 9, 13, 6, 1127, 1365, 10, 3463, 6, 12, 5063, 16, 3, 7857, 8683, 7205, 14, 9143