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: ['5995', 'W', 'f', '1263', '4651', '9859', 'm', '4233', '1969', '3523', 'B', 'I', '6045', 'd']

5995, 23, 6, 1263, 4651, 9859, 13, 4233, 1969, 3523, 2, 9, 6045, 4