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: ['8619', '3945', '9655', 'N', 'Z', '3639', '8531', 'M', 'm', 'F', 'Z']

8619, 3945, 9655, 14, 26, 3639, 8531, 13, 13, 6, 26