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: ['7621', 'V', '139', '1907', 's', '1293', 'D', '9183', '8067', 'S', 'O', 'Q', '1725', '9827']

7621, 22, 139, 1907, 19, 1293, 4, 9183, 8067, 19, 15, 17, 1725, 9827