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: ['Z', 'T', '1029', '1293', '1877', 'R', 'j', '5075', '4967', '2879']

26, 20, 1029, 1293, 1877, 18, 10, 5075, 4967, 2879