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: ['1649', '5511', '5051', 'I', '1049', '5199', '8541']

1649, 5511, 5051, 9, 1049, 5199, 8541