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', '9759', '1655', '8067', '9995', 'P', '5193', '1365', '7129', 'y', 'y', 'O', 'b', 'H']

13, 9759, 1655, 8067, 9995, 16, 5193, 1365, 7129, 25, 25, 15, 2, 8