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: ['2803', '8645', '5965', 'O', '6727', '9339', '2529', 't', 'G', 'Y', '6601', '8649', '3489', 'C', '5925', '8741', '5529', 'f', 'y', '5925', '597', '7535', 'c', 'J', '647', 'h']

2803, 8645, 5965, 15, 6727, 9339, 2529, 20, 7, 25, 6601, 8649, 3489, 3, 5925, 8741, 5529, 6, 25, 5925, 597, 7535, 3, 10, 647, 8