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: ['P', '9573', '9835', '8743', 'w', '5653', 'Q', '4385', 'o', 'W', '7383', '5543', 'Q', '1825', '7483', '1729', 'z', '345', '31', '3325', '2175', '571', '541', '5709', 'B', '7963']

16, 9573, 9835, 8743, 23, 5653, 17, 4385, 15, 23, 7383, 5543, 17, 1825, 7483, 1729, 26, 345, 31, 3325, 2175, 571, 541, 5709, 2, 7963