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: ['3649', '4365', '123', '6143', '9811', 's', 'k', 'D', 'q', '6177', '9637', 'G', 'R', '4939', '6849', '2251', '5901', 'f', 'q', '9759', '3339']

3649, 4365, 123, 6143, 9811, 19, 11, 4, 17, 6177, 9637, 7, 18, 4939, 6849, 2251, 5901, 6, 17, 9759, 3339