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.
Input: ['7243', '6861', 'm', '2381', '6645', 'n', 'i', 'M', 'x', '1383']

7243, 6861, 13, 2381, 6645, 14, 9, 13, 24, 1383