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: ['G', '7849', 'N', '4117', '6027', '6831', '3027', '6469', '1515', '3471', '7973', '7107', '5319']

7, 7849, 14, 4117, 6027, 6831, 3027, 6469, 1515, 3471, 7973, 7107, 5319