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: ['V', '8817', 'f', 'r', '1287', '411', '1437', 'E', 'T', 'S', '3927', 's', '6147', '4347', 's', 'z', 'X', '7809']

22, 8817, 6, 18, 1287, 411, 1437, 5, 20, 19, 3927, 19, 6147, 4347, 19, 26, 24, 7809