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: ['S', '8787', '199', 'V', 'S', '7925', '7415', 'R', '5263', 'K', 'i', '5157', '7767', 'K', '9465', 'V', 'b', '6141', '913', 'Q', 'Y', 'B', '8223', 'P', 'c', 'f', '9953', '3541', 'o', 'a', 'e', '4793', 'A', '1319', '9349', 'M', 'H', '9773']

19, 8787, 199, 22, 19, 7925, 7415, 18, 5263, 11, 9, 5157, 7767, 11, 9465, 22, 2, 6141, 913, 17, 25, 2, 8223, 16, 3, 6, 9953, 3541, 15, 1, 5, 4793, 1, 1319, 9349, 13, 8, 9773