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: ['2255', 'Q', 'q', 'D', '869', '5539', 'h', '2527', '4011', '9113', '7913', '6991', 'C', '1615', '4391', 'm', '6939', 'm', 'u', '3345', '7445', 'L', '5521', '3371', '2503', 'N', 't']

2255, 17, 17, 4, 869, 5539, 8, 2527, 4011, 9113, 7913, 6991, 3, 1615, 4391, 13, 6939, 13, 21, 3345, 7445, 12, 5521, 3371, 2503, 14, 20