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: ['M', '665', '9747', 't', '7849', '221', 'U', '7753', '2743', 'O', 'w', '2361', 'D', '7899', 'K', '4929', '8967', '9447', '9025', '4209', '1499', '1201', 's', '4449', '819', '2851', 'z']

13, 665, 9747, 20, 7849, 221, 21, 7753, 2743, 15, 23, 2361, 4, 7899, 11, 4929, 8967, 9447, 9025, 4209, 1499, 1201, 19, 4449, 819, 2851, 26