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: ['g', 'O', 'r', 'H', '1703', 'E', '7265', '647', 't', 'P', 's', 'T', 'r', '8461', 'D', '1041', '591', '4125', 'i', '7289', '7233']

7, 15, 18, 8, 1703, 5, 7265, 647, 20, 16, 19, 20, 18, 8461, 4, 1041, 591, 4125, 9, 7289, 7233