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: ['333', 'u', 'x', 'r', '2191', '6127', 'T', '7095', 'H', '7617', 's', '6597', 't', '1335', 'm', '9819']

333, 21, 24, 18, 2191, 6127, 20, 7095, 8, 7617, 19, 6597, 20, 1335, 13, 9819