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: ['2175', 'C', 'Q', 'g', '7373', 'd', 'i', '5135', 'B', '2853', 'C', '7511', '1', 'Y', 'f', '4801', '8003', 'L', 'M', 'g', '8879', 'x', 'I', 'o', '8449', 'y']

2175, 3, 17, 7, 7373, 4, 9, 5135, 2, 2853, 3, 7511, 1, 25, 6, 4801, 8003, 12, 13, 7, 8879, 24, 9, 15, 8449, 25