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: ['207', 'o', '9845', 'F', '2811', '5129', '7357']

207, 15, 9845, 6, 2811, 5129, 7357