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: ['z', '2499', '4061', 'R', 'q', '8195', '8707', 't', '4287', 'v', '9555', '5127', '8677', '9907', '6855', 'K', '8965', '7433', 'c', '9509', 'Z']

26, 2499, 4061, 18, 17, 8195, 8707, 20, 4287, 22, 9555, 5127, 8677, 9907, 6855, 11, 8965, 7433, 3, 9509, 26