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: ['9813', '6621', 'u', '4759', '5261', 'i', 'M', 'f', 'Z', '6059', '2695', 'A', 'r', 'n', '4959', 'A', '7157', 'g', '561', '1065', '1469']

9813, 6621, 21, 4759, 5261, 9, 13, 6, 26, 6059, 2695, 1, 18, 14, 4959, 1, 7157, 7, 561, 1065, 1469