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: ['l', 'j', '2871', 's', '9993', 't', 'f', '5869', 's', 'R', '1393', 'h', '7691', '4297', '6907', 'n', '2237', 'f', 'E', '6539', '1533', '8303', '2085', 'c', 'm', '2301', '2287', '3611', 'A', '4505', '7081', 'x', 'd', 'X', 'g', '5691', '215']

12, 10, 2871, 19, 9993, 20, 6, 5869, 19, 18, 1393, 8, 7691, 4297, 6907, 14, 2237, 6, 5, 6539, 1533, 8303, 2085, 3, 13, 2301, 2287, 3611, 1, 4505, 7081, 24, 4, 24, 7, 5691, 215