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: ['Y', 'r', 'F', 'W', 'h', '431', '1143', 'w', 'w', '8211', 'a', 'X', '6703', 'q', 'y', '889', 'u', '3811', '6299', '8691', '9831', '5321']

25, 18, 6, 23, 8, 431, 1143, 23, 23, 8211, 1, 24, 6703, 17, 25, 889, 21, 3811, 6299, 8691, 9831, 5321