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: ['7443', '571', '7895', 'i', '8613', 'k', '7899', '1785', '3345', 'L', '5263', 'd', '5983', 'f', 'm', '3051', '7481', 'j', '8939', '8901', 'C', 'H', 'Z', 'E', '4703', '7789', 'o']

7443, 571, 7895, 9, 8613, 11, 7899, 1785, 3345, 12, 5263, 4, 5983, 6, 13, 3051, 7481, 10, 8939, 8901, 3, 8, 26, 5, 4703, 7789, 15