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: ['F', '6557', '8621', 'W', '6745', 'i', '3355', 'm', 'G', 'd', 'V', '9823', 'A', '1251', 'X', 'M', 'I', 't', 'R', '8733', '1211', '3001', '8589', '1017', '8987', '5071', '4627', 'f', '1477']

6, 6557, 8621, 23, 6745, 9, 3355, 13, 7, 4, 22, 9823, 1, 1251, 24, 13, 9, 20, 18, 8733, 1211, 3001, 8589, 1017, 8987, 5071, 4627, 6, 1477