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: ['4757', 'S', '8505', 'U', 'P', 'F', 'd', '43', '7607', '4785', '4401', '1683', 'V', '3035', '5829', '4187', 'w', '4201', '4739', 'j', 'k', 'i', '6299', '6625', '3143', '2945', 'C', 'g', 'r']

4757, 19, 8505, 21, 16, 6, 4, 43, 7607, 4785, 4401, 1683, 22, 3035, 5829, 4187, 23, 4201, 4739, 10, 11, 9, 6299, 6625, 3143, 2945, 3, 7, 18