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: ['e', '6719', 'M', 'c', 'X', 'O', '5371', 'f', '1125', 'M', 'P', '7745', 'C', 'x', '9883', 'S', 'e', '1377', 'v', '9911', '3747', '5249', '6659', 'f', '6985', 'b', '9199', 'Y', '8079', '1373']

5, 6719, 13, 3, 24, 15, 5371, 6, 1125, 13, 16, 7745, 3, 24, 9883, 19, 5, 1377, 22, 9911, 3747, 5249, 6659, 6, 6985, 2, 9199, 25, 8079, 1373