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: ['P', '4623', 'j', 'f', 'V', '939', 'x', '6193', 'p', '3745', 'A', '3725', 'R', 'h', 'c', 'x', '5819']

16, 4623, 10, 6, 22, 939, 24, 6193, 16, 3745, 1, 3725, 18, 8, 3, 24, 5819