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: ['7787', 'y', '5305', 'T', '205', 'O', 'E', '2203', '8385', 'F', '9869', 'h', 'q', '229', 'S', 'r', '5683', '3649', 'Z']

7787, 25, 5305, 20, 205, 15, 5, 2203, 8385, 6, 9869, 8, 17, 229, 19, 18, 5683, 3649, 26