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: ['9897', 'F', '6703', 'o', 'x', 'I', '5809', '937', '509', 'h', 'W', 'C', 'w', '5175', '3505', '1201', '2229', '9657', 'H', '7989', 'O', 'n', '7587', 'n', 'O', 'P', '4419', 'B']

9897, 6, 6703, 15, 24, 9, 5809, 937, 509, 8, 23, 3, 23, 5175, 3505, 1201, 2229, 9657, 8, 7989, 15, 14, 7587, 14, 15, 16, 4419, 2