Detailed Instructions: 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.
Q: ['6291', 'f', '3791', '1765', 'b', '5809', 'V', 'O', 'p', 'Y', '9025', 's', 'E', '691', 'X', 'B', 'K', 'S', '4549']
A:
6291, 6, 3791, 1765, 2, 5809, 22, 15, 16, 25, 9025, 19, 5, 691, 24, 2, 11, 19, 4549