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: ['M', '397', '7927', 'V', '5521', 'T', 'y', '9897', '95', '691', 's', 'l']

13, 397, 7927, 22, 5521, 20, 25, 9897, 95, 691, 19, 12