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: ['9351', '4565', '6005', 'l', 'I', 'C', '2431', '6687', '827', 'Z', 'D', 'g', 'P']

9351, 4565, 6005, 12, 9, 3, 2431, 6687, 827, 26, 4, 7, 16