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: ['r', '8349', 'v', 'B', '6385', '6105', '3859', '3535', '8279', 'Z', '4157', 'N']

18, 8349, 22, 2, 6385, 6105, 3859, 3535, 8279, 26, 4157, 14