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: ['6969', 'O', 'O', '73', 'o', 'k', 'p', '8075', '8029', 'N', 'I', 'k', 'z', '5591', '7163', 'o', '6465', 'h', '8963', '243']

6969, 15, 15, 73, 15, 11, 16, 8075, 8029, 14, 9, 11, 26, 5591, 7163, 15, 6465, 8, 8963, 243