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: ['c', 'z', 'R', '6989', '4945', 'V', 'a', 'i', 'f', 'S', 'q', 'a', 'G', 'M', '5993', '31', '2119', 's']

3, 26, 18, 6989, 4945, 22, 1, 9, 6, 19, 17, 1, 7, 13, 5993, 31, 2119, 19