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: ['6451', 'I', 'V', 'k', '8815', '4889', 'l', 'P', '7045', 'I', 'X', 'F', '7083']

6451, 9, 22, 11, 8815, 4889, 12, 16, 7045, 9, 24, 6, 7083