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: ['O', 'L', 'x', 'q', '3571', 'v', '547', '719', 'z', 'f', '4581', 'E', 'a', '4603', 'N', 'C', 'z', 'w', 'G', '4637', 'P', '7303']

15, 12, 24, 17, 3571, 22, 547, 719, 26, 6, 4581, 5, 1, 4603, 14, 3, 26, 23, 7, 4637, 16, 7303