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: ['f', 'F', '2793', '9399', 'L', '7759', '8349', '5513', 't', 'g', 'i', 'h', '7361', '2403', '1393', 'v', 'U', 'A', 't', 'r', 'T']

6, 6, 2793, 9399, 12, 7759, 8349, 5513, 20, 7, 9, 8, 7361, 2403, 1393, 22, 21, 1, 20, 18, 20