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: ['F', 'S', 'A', '6403', 'B', '9313', '9165', 'v', '6865', 'H', 'K', 'v', 'g', '9895', 's', '4633', 'm', 'P']

6, 19, 1, 6403, 2, 9313, 9165, 22, 6865, 8, 11, 22, 7, 9895, 19, 4633, 13, 16