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: ['703', 'R', 'B', 'W', 'H', 'k', 'q', 'N', '6147', 'i', '807', '6803', '8867', 'k', '7201', 'm', 'l']

703, 18, 2, 23, 8, 11, 17, 14, 6147, 9, 807, 6803, 8867, 11, 7201, 13, 12