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: ['5979', '9313', '8787', 'R', 'B', 'm', 'X', '5077', '9681', '8195', 'N', 'r', '2275', 'm', 'c', 'W', '5827', 'b', 'Y', '4927', 'j', 'B', '3487', '5139', '6169', 'S', 'g', 'g', '2157', 'Z', '6221', 'X', '21', 'f', 't', 'Z', 'm', '8513', '4115']

5979, 9313, 8787, 18, 2, 13, 24, 5077, 9681, 8195, 14, 18, 2275, 13, 3, 23, 5827, 2, 25, 4927, 10, 2, 3487, 5139, 6169, 19, 7, 7, 2157, 26, 6221, 24, 21, 6, 20, 26, 13, 8513, 4115