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: ['s', 'g', 't', 'u', 'x', 'z', 'X', 'v', '2583', '7683', '5229', '4079', 'J', 'M', 'n', 'a', '8501', 'O', '1121', '9931', '5603']

19, 7, 20, 21, 24, 26, 24, 22, 2583, 7683, 5229, 4079, 10, 13, 14, 1, 8501, 15, 1121, 9931, 5603