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: ['u', 'o', 'v', 'I', '203', '3013', 'z', '637', '8639', 'd', '3635', 'A', 'V', '5291']

21, 15, 22, 9, 203, 3013, 26, 637, 8639, 4, 3635, 1, 22, 5291