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', '6231', 'V', '1917', 'L', 'Z', '3365', 'd', '2043', '5611', '6167', '3619', '1855', '2951', '8431', '5315', '8195', '5449', 'C', '8039', '2793', '4957', 'S', 'o']

21, 6231, 22, 1917, 12, 26, 3365, 4, 2043, 5611, 6167, 3619, 1855, 2951, 8431, 5315, 8195, 5449, 3, 8039, 2793, 4957, 19, 15