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: ['H', '3513', '1663', '2677', '563', '6423', '383', 'P', '975', 'U', '985', '2159', 'N', 'o', 'r', '1907', 'D', 'U', 'q', '7843', 'g', '3793', 'G', '2069', '369', '5339', 'R', 'z', 'l', 'i', '3075', '687', '9743', '7221', 'I', '3609']

8, 3513, 1663, 2677, 563, 6423, 383, 16, 975, 21, 985, 2159, 14, 15, 18, 1907, 4, 21, 17, 7843, 7, 3793, 7, 2069, 369, 5339, 18, 26, 12, 9, 3075, 687, 9743, 7221, 9, 3609