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: ['o', 'j', 'l', 'B', '3701', '6009', 'v', '6707', 'h', 'g', 'z', '5363', 'C', 'v', 'G', '3691', 'q', 'l', '2899', '2781', 'X', '7471', 'k', 'v', 'Z', 'l', '5899']

15, 10, 12, 2, 3701, 6009, 22, 6707, 8, 7, 26, 5363, 3, 22, 7, 3691, 17, 12, 2899, 2781, 24, 7471, 11, 22, 26, 12, 5899