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: ['j', 'u', '7291', 'i', '3329', 's', 'p', 'A', 'h', 'i', 'a', 's', '6987', '7169', 'T', 'K', 'C', '4991', 'A', 'A', 'h', '6997', 'h']

10, 21, 7291, 9, 3329, 19, 16, 1, 8, 9, 1, 19, 6987, 7169, 20, 11, 3, 4991, 1, 1, 8, 6997, 8