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: ['9117', 'M', '845', '6863', 'E', '9669', '2179', 'E', '2533', 'i', '5701', 'I', 'R', '7815', '5315', 'c', '4053', '1643', 'v', '8171', '6979', 'p', 'b']

9117, 13, 845, 6863, 5, 9669, 2179, 5, 2533, 9, 5701, 9, 18, 7815, 5315, 3, 4053, 1643, 22, 8171, 6979, 16, 2