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: ['9711', '3391', '8255', '1313', '7709', 'f', 'Q', 'Q', '1995', '1909', 'B', 'L', '6693', 'L', '6935', 'l', 't', 'Y', '7591', '5659']

9711, 3391, 8255, 1313, 7709, 6, 17, 17, 1995, 1909, 2, 12, 6693, 12, 6935, 12, 20, 25, 7591, 5659