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: ['9999', '4513', '531', '9471', 'm', '7497', '991', 'g', '6793', '7347', '3967', '1783', '7811', '6819', 'h', 'F', '6817', '6957', 'V', '637', 'A', '4143', 'S', '249', 'F', 'a', 'H', 'e']

9999, 4513, 531, 9471, 13, 7497, 991, 7, 6793, 7347, 3967, 1783, 7811, 6819, 8, 6, 6817, 6957, 22, 637, 1, 4143, 19, 249, 6, 1, 8, 5