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: ['w', '9907', 'I', 'k', '2033', 'M', '2451', '7747', '3341', '87', 'j', '4017', '3177', 't', 'o', 's', '5761', 'u']

23, 9907, 9, 11, 2033, 13, 2451, 7747, 3341, 87, 10, 4017, 3177, 20, 15, 19, 5761, 21