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: ['1985', '5421', '6031', '91', 'M', 'D', 'U', '7557', 'B', '1611', 'i', '2927', 'K', '8301', '3327', 'N', '1981', 'U', '4963', 'X', '5601', '4215', '6447', '9133', 'N', '4191', '2313', '8763', 'A', 'f', '1817', 'G', 'g', '2603', 'o', 'm', 'W', '3725', '7123']

1985, 5421, 6031, 91, 13, 4, 21, 7557, 2, 1611, 9, 2927, 11, 8301, 3327, 14, 1981, 21, 4963, 24, 5601, 4215, 6447, 9133, 14, 4191, 2313, 8763, 1, 6, 1817, 7, 7, 2603, 15, 13, 23, 3725, 7123