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: ['B', '9183', 'Q', '5211', '5455', 'o', '7273', '1775', '7447']

2, 9183, 17, 5211, 5455, 15, 7273, 1775, 7447