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: ['i', 'G', '4421', '4179', 'U', 'I', '1123', '3779', '4623', '8307', '6413', 'J', 'V', 'O', 'C', '2459', '9325', 'p', 'R', '7909', '7311', 'l', 'g']

9, 7, 4421, 4179, 21, 9, 1123, 3779, 4623, 8307, 6413, 10, 22, 15, 3, 2459, 9325, 16, 18, 7909, 7311, 12, 7