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: ['P', 'u', 'b', 'E', '5719', 'l', '4621', 'Q', 'V', '2165', 'e', 'V', '125', '1497']

16, 21, 2, 5, 5719, 12, 4621, 17, 22, 2165, 5, 22, 125, 1497