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', '8425', '7889', 'f', '6913', 'g', 'G', 'o', '9973', 'g', 'F', '9029', '9689', '1261', '5345', '9889', 'Z', '489', '1521', '7483', '6823', '2255', 't', 'i']

16, 8425, 7889, 6, 6913, 7, 7, 15, 9973, 7, 6, 9029, 9689, 1261, 5345, 9889, 26, 489, 1521, 7483, 6823, 2255, 20, 9