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', 'G', 'o', '7335', 'u', '3805', '6031', 'e', '6499', '6609', '805', '6923', 'r', 'c', 'u', '5781', 'L', 'j', 'R', '9691', '6803', '7919', '6587', 'h', 'i', 'x', '663', 'c']

15, 7, 15, 7335, 21, 3805, 6031, 5, 6499, 6609, 805, 6923, 18, 3, 21, 5781, 12, 10, 18, 9691, 6803, 7919, 6587, 8, 9, 24, 663, 3