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: ['6949', '8349', '2873', '9279', 'i', 'w', '4639', 'r', 'd', 'H']

6949, 8349, 2873, 9279, 9, 23, 4639, 18, 4, 8