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', '6687', '2277', 'o', '7787', 'Z', 'b', 'I', '9983', 'N']

21, 6687, 2277, 15, 7787, 26, 2, 9, 9983, 14