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: ['L', 'm', 'r', 'v', '2023', 'f', 'T', '507', 'B', '6455', '6151', '8147', 'T', 'C', '769', 'R', '3307', 'm', '1049', 'Q', 'U', '2649', '7523', 'u', '3023', '9099', 'E', '6119', '6535', '5435', '2949', '857', 'x']

12, 13, 18, 22, 2023, 6, 20, 507, 2, 6455, 6151, 8147, 20, 3, 769, 18, 3307, 13, 1049, 17, 21, 2649, 7523, 21, 3023, 9099, 5, 6119, 6535, 5435, 2949, 857, 24