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', '8591', '6205', 'x', '7221', 'I', 'Q', 'G', 'X', '7255', '175', '8709', 'W', '5283', '1181', 'B', '2507', 'N', 'd', '7725', '4387', 's', '5165', '8823', '6371', '3379', '5231', 'I', 'E', 'N', 'n', 'k', 'g', 'g', '5059', '2879', '6879', '1637', 'n']

15, 8591, 6205, 24, 7221, 9, 17, 7, 24, 7255, 175, 8709, 23, 5283, 1181, 2, 2507, 14, 4, 7725, 4387, 19, 5165, 8823, 6371, 3379, 5231, 9, 5, 14, 14, 11, 7, 7, 5059, 2879, 6879, 1637, 14