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: ['6829', 'o', '1685', 'v', '2241', '6759', '2551', '985', 'y', '3467', 'N', '3355', 'o', '2375', 'z', '1037', '5649', 'o']

6829, 15, 1685, 22, 2241, 6759, 2551, 985, 25, 3467, 14, 3355, 15, 2375, 26, 1037, 5649, 15