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: ['u', 'z', '1751', 'E', 'I', 'M', 'f', '2333', 'o']

21, 26, 1751, 5, 9, 13, 6, 2333, 15