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: ['R', '7947', '3915', 'A', '7673', '7043', '3331', '6333', 't', '9037', '3243', '9717', 'L', 'F', 'R', 'P', '203', 'D', 'h', '8759', '3385', '7887', '6089', 'E', '8975', 'g', 'N', '9901']

18, 7947, 3915, 1, 7673, 7043, 3331, 6333, 20, 9037, 3243, 9717, 12, 6, 18, 16, 203, 4, 8, 8759, 3385, 7887, 6089, 5, 8975, 7, 14, 9901