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: ['x', 'S', 'O', 'A', '4611', '7227', 'n', '7449', 'I', 'G', '1127', '4955', '7133', 'Z', '8713', 'b']

24, 19, 15, 1, 4611, 7227, 14, 7449, 9, 7, 1127, 4955, 7133, 26, 8713, 2