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: ['4631', 'j', 'B', 'j', 'O', 'U', 'B', '5061', '507', '4907', '4157', '5999', 'n', 'I', 'E', '2825', 'c', '2347']

4631, 10, 2, 10, 15, 21, 2, 5061, 507, 4907, 4157, 5999, 14, 9, 5, 2825, 3, 2347