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: ['Z', 'A', 't', '6831', 'B', '3563', 'm', 'x', '3049', 'r', 'Q', 'e', 'F', 'd', 'b', '2831', '9805', 'u', 'y', '277']

26, 1, 20, 6831, 2, 3563, 13, 24, 3049, 18, 17, 5, 6, 4, 2, 2831, 9805, 21, 25, 277