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: ['R', 'E', '2501', 'S', 'A', 'h', '7057', 'S', 'g', '9621']

18, 5, 2501, 19, 1, 8, 7057, 19, 7, 9621