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: ['a', '6167', '5785', 'r', '173', '933', '153', '7597', '8693', '6493', 'G', 'I', 'U', '6565']

1, 6167, 5785, 18, 173, 933, 153, 7597, 8693, 6493, 7, 9, 21, 6565