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: ['s', '8995', 'o', 'i', 'i', '7659', 'K', '9807', 'r', '8103', '1141', '9329', '7725', '263', '9259', '2621']

19, 8995, 15, 9, 9, 7659, 11, 9807, 18, 8103, 1141, 9329, 7725, 263, 9259, 2621