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: ['b', 'g', 't', 'H', 'F', 'n', '8683', '9445', 'f', 'E', 'i', '8115', 'k', 't', '705', '6755', 'L', '3905']

2, 7, 20, 8, 6, 14, 8683, 9445, 6, 5, 9, 8115, 11, 20, 705, 6755, 12, 3905