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: ['3171', '781', 'o', '2541', '3163', '6909', 'F', '3237', 'h', '6669', 'T', '4479', 'b', '1907', 'O']

3171, 781, 15, 2541, 3163, 6909, 6, 3237, 8, 6669, 20, 4479, 2, 1907, 15