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: ['g', 'T', 'u', 'U', 's', 's', 'W', 'W', '2955', 'b', 'e', 's']

7, 20, 21, 21, 19, 19, 23, 23, 2955, 2, 5, 19