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: ['m', '7539', 'b', '2731', 'u', 'Y', 's', 'k', 'A', '4703', 'C', '5115', 'q', 'F', 'P', 'Y', 'q']

13, 7539, 2, 2731, 21, 25, 19, 11, 1, 4703, 3, 5115, 17, 6, 16, 25, 17