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: ['z', '4889', '5037', '8693', 'i', 'j', '7431', 'p', '3639', 'v', 'e', 'c', 's', 'd', 'Y', '6621', 'R', '7697']

26, 4889, 5037, 8693, 9, 10, 7431, 16, 3639, 22, 5, 3, 19, 4, 25, 6621, 18, 7697