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: ['e', 'M', 'G', 'N', '3979', '1511', '3855', '2459', '6713', 'R', '6817', '8661', 'r', 'z', 'j']

5, 13, 7, 14, 3979, 1511, 3855, 2459, 6713, 18, 6817, 8661, 18, 26, 10