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: ['2793', 'u', 'J', '4535', '1287', '3121', '8863', '835', 'z', '6415', 'B', '1951', '5501', '3513', '8109', 'c', 'c', 'O', 'z', '1207', 'd', '6415', '4123', 'T', '8769', '8483', '7535', 'i', 'b', '1189', '5827', 'G', '4301', 'l']

2793, 21, 10, 4535, 1287, 3121, 8863, 835, 26, 6415, 2, 1951, 5501, 3513, 8109, 3, 3, 15, 26, 1207, 4, 6415, 4123, 20, 8769, 8483, 7535, 9, 2, 1189, 5827, 7, 4301, 12