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: ['m', '4169', 'f', '5957', 'U', '8773', 'a', 'I', 'V']

13, 4169, 6, 5957, 21, 8773, 1, 9, 22