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: ['f', '547', 'C', 'B', 'o', '8587', 'Q', '2219', 'i', 'm', 'm', 'c', 'R', 'V', '6617', 'I', '4061', 'b', 'V', 'd', 'J', '939', 'E', '6459', '1031', '5411', 'S', '4413', '8557', '3605', 'u', 'd', '1899', '7981', 'V', 'a', '2815']

6, 547, 3, 2, 15, 8587, 17, 2219, 9, 13, 13, 3, 18, 22, 6617, 9, 4061, 2, 22, 4, 10, 939, 5, 6459, 1031, 5411, 19, 4413, 8557, 3605, 21, 4, 1899, 7981, 22, 1, 2815