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: ['5557', '2219', '9567', '927', '1619', 'l', 'y', '7739', '4099', 'P']

5557, 2219, 9567, 927, 1619, 12, 25, 7739, 4099, 16