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: ['7371', 'x', 'K', '6777', 'k', 'f', '1583', 'k', '2995', '5245', '5841', '4613', 'O', 'n', '4839']

7371, 24, 11, 6777, 11, 6, 1583, 11, 2995, 5245, 5841, 4613, 15, 14, 4839