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: ['t', '1859', 'H', 'V', 'U', 't', 'e', '6099', 'y', 'Z', 'M', '8795']

20, 1859, 8, 22, 21, 20, 5, 6099, 25, 26, 13, 8795