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: ['7669', 'C', 'J', 'y', 'x', '6883', 'd', 'C', '6369', '8913', 'w', '1185', 'i', 'M', 'U', 'H', '5277', 'P', '4357', 'q', '8155']

7669, 3, 10, 25, 24, 6883, 4, 3, 6369, 8913, 23, 1185, 9, 13, 21, 8, 5277, 16, 4357, 17, 8155