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: ['C', '4191', 's', 'h', 'p', 'V', '1227', 'U', '721', '97', '2119', '353', '3567', 'l', '2431', '3051', 'P', '9997', 'b', '5993', 'T', '1361', 'l', 'Y', '6587', '3111']

3, 4191, 19, 8, 16, 22, 1227, 21, 721, 97, 2119, 353, 3567, 12, 2431, 3051, 16, 9997, 2, 5993, 20, 1361, 12, 25, 6587, 3111