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', 'v', 'i', 'A', '8513', 'f', 'v', 'M', '7751', 'M', 's', 'b', 'm', 'V', 'G', 'q', '5961', 'l', 'P', 'S']

13, 22, 9, 1, 8513, 6, 22, 13, 7751, 13, 19, 2, 13, 22, 7, 17, 5961, 12, 16, 19