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: ['6981', 'H', 'V', '4757', 'W', '4779', 'j', '5005', '6997', '8323', '9447', '5473', '3003', '4269', 'd', '1115', 'i', 's', 'm', 'm', 'Y', 'X', 'm', '5139', '5521', '6455', '1727', 'A', 'm', 'x', '2429']

6981, 8, 22, 4757, 23, 4779, 10, 5005, 6997, 8323, 9447, 5473, 3003, 4269, 4, 1115, 9, 19, 13, 13, 25, 24, 13, 5139, 5521, 6455, 1727, 1, 13, 24, 2429