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: ['X', 'u', '2793', 'w', 'Z', '5131', '5401', '761', '7255', '8793', 'r', 'R', '687', '3219']

24, 21, 2793, 23, 26, 5131, 5401, 761, 7255, 8793, 18, 18, 687, 3219