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: ['F', 'n', 'J', '913', 'm', 'R', '2645', '1045', '5535', 'N', '7589', 'z', '2525', 'g', '9889', 'n', 'T']

6, 14, 10, 913, 13, 18, 2645, 1045, 5535, 14, 7589, 26, 2525, 7, 9889, 14, 20