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: ['s', 'o', 'M', '7723', '7605', 'Z', '2923', 'R', 'O', 'E', 'B', 's', '411', 'U', 'T', 'k', 'l', '3281', 'c', '9919', '6887', '2793', '4495', '4475']

19, 15, 13, 7723, 7605, 26, 2923, 18, 15, 5, 2, 19, 411, 21, 20, 11, 12, 3281, 3, 9919, 6887, 2793, 4495, 4475