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: ['6625', 'T', 'u', '8997', '7185', 'M', '9067', '1831', '3279', '7411', 'Z', '6285', '8773', '903', 'O', 'k', 'Z', '851', 'u', 'P', '9631', '2597', 'i', '6787']

6625, 20, 21, 8997, 7185, 13, 9067, 1831, 3279, 7411, 26, 6285, 8773, 903, 15, 11, 26, 851, 21, 16, 9631, 2597, 9, 6787