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: ['611', 'C', '2367', 'a', '369', '241', 'x', '3267', 'r', 'd', '9767', 'M', 'O', '553', 'J', 'K', 'O', 'M', 'f', 'C', '3993', '1511', 'g', '2783', 'R', '1557', '5841', '4557', 'D', '6887', 'l', '3215', '5301', 'Z', 'X', '7545']

611, 3, 2367, 1, 369, 241, 24, 3267, 18, 4, 9767, 13, 15, 553, 10, 11, 15, 13, 6, 3, 3993, 1511, 7, 2783, 18, 1557, 5841, 4557, 4, 6887, 12, 3215, 5301, 26, 24, 7545