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: ['N', 'R', 'W', '7465', '7983', 'J', 'V', 'u', '2855', '6815', 'l', '5985', 'Q', '939', 'D', 'F', 'B', 'B', '1091', 'J', 'n', '8029']

14, 18, 23, 7465, 7983, 10, 22, 21, 2855, 6815, 12, 5985, 17, 939, 4, 6, 2, 2, 1091, 10, 14, 8029