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', 'F', '3631', 'M', '8413', 'h', 'n', 'f', '9353', 'Z', 'n', '3233', 'p', '2439', 'm', 'E', '3061', 'g', 'v', 'u', '8455']

6, 6, 3631, 13, 8413, 8, 14, 6, 9353, 26, 14, 3233, 16, 2439, 13, 5, 3061, 7, 22, 21, 8455