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: ['T', '727', 'i', 't', 'U', '9929', 'b', '5487', 'R', 'e', 'T', '2953', 'u', '197', 'H', '3399', 'R', '7577', 'K', 'i', 'X', '1639', 'T', '5001']

20, 727, 9, 20, 21, 9929, 2, 5487, 18, 5, 20, 2953, 21, 197, 8, 3399, 18, 7577, 11, 9, 24, 1639, 20, 5001