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', '4013', '5207', 'd', '2581', '5705', 'R', '147', 'd', '1413', 'A', '7935', 'F', 'k', 'P', 'N', '4181', 's', '1143', '9377', '683', '3131', 'T', 'Z']

3, 4013, 5207, 4, 2581, 5705, 18, 147, 4, 1413, 1, 7935, 6, 11, 16, 14, 4181, 19, 1143, 9377, 683, 3131, 20, 26