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: ['8707', 'y', 'P', '8647', 'E', 'x', 'n', 'j', '313', '5393', '229', 'o', '861', '7481', 'e', 'e', '2339', '1655', '3751', '3369', '207', 'C', 'd', '2435', '1151', 'T', '2637']

8707, 25, 16, 8647, 5, 24, 14, 10, 313, 5393, 229, 15, 861, 7481, 5, 5, 2339, 1655, 3751, 3369, 207, 3, 4, 2435, 1151, 20, 2637