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: ['7657', '5617', '9889', 's', '2595', 'o', '817', 'n', 'Z', 'm', '5909', '3995', '8615', 'A', '8135', 'B', '2899', 'E', '6103', 'E', 'P', '1745', 'n']

7657, 5617, 9889, 19, 2595, 15, 817, 14, 26, 13, 5909, 3995, 8615, 1, 8135, 2, 2899, 5, 6103, 5, 16, 1745, 14