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: ['6923', 'T', 'Z', 'K', '4161', 'S', '8003', 'E', 'W', 'O', 'V', 'P', '6647', 'J', '6293', '7587', 'o', '1369', 'N']

6923, 20, 26, 11, 4161, 19, 8003, 5, 23, 15, 22, 16, 6647, 10, 6293, 7587, 15, 1369, 14