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: ['9093', 'T', '7465', '8911', 'U', 'd', 't', '9501', 'l', 'M', '1917', '1899', '7739']

9093, 20, 7465, 8911, 21, 4, 20, 9501, 12, 13, 1917, 1899, 7739