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', '4267', 'F', '363', 'k', '5627', '3925']

18, 4267, 6, 363, 11, 5627, 3925