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: ['L', '4733', 'f', 'r', 'o', 'Z', '127', 'l', 'n', 'R', '5759', 'V', 'T', '9307', '7169', 's', 's', 'C']

12, 4733, 6, 18, 15, 26, 127, 12, 14, 18, 5759, 22, 20, 9307, 7169, 19, 19, 3