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: ['2475', '1783', '6591', '7759', '2297', 'w', 'c', 'q', 'm', '6901', '4683', '5033', '391', '89', 'X', 'e', '4789', 'c', '6325', '5011', 'P', 'U', 'g', 'Z', '981', 'r', 'P', '2227', 'u', 'J', '8487', '8611', 'i', 'r']

2475, 1783, 6591, 7759, 2297, 23, 3, 17, 13, 6901, 4683, 5033, 391, 89, 24, 5, 4789, 3, 6325, 5011, 16, 21, 7, 26, 981, 18, 16, 2227, 21, 10, 8487, 8611, 9, 18