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', '849', 'Z', 'h', 's', '6483', '9729', '2887', '4745', 'd', '8157', '1287', '285', '9441', 'c', 'c', 'o', '9447', 'v', '6177', '8653', '2713']

18, 849, 26, 8, 19, 6483, 9729, 2887, 4745, 4, 8157, 1287, 285, 9441, 3, 3, 15, 9447, 22, 6177, 8653, 2713