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: ['N', 's', '8283', 'O', 'R', '9621', 'X', 'j', '3051', 'o', '3621']

14, 19, 8283, 15, 18, 9621, 24, 10, 3051, 15, 3621