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: ['t', '4685', '3791', 'J', 'r', '5857', 'w', '9739', '4747', '163', '2003', 'm']

20, 4685, 3791, 10, 18, 5857, 23, 9739, 4747, 163, 2003, 13