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: ['i', 'n', 's', 'l', 'z', 'Q', '1879', '4667', '1815', 'D']

9, 14, 19, 12, 26, 17, 1879, 4667, 1815, 4