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: ['l', 'b', 'V', '5933', '4777', '5389', '9299', '421', 'P', '4141', 'M', 'F', 'd', 't', 'j', 'Y', 't', 'U', 'i', 'm', 'A', '7121']

12, 2, 22, 5933, 4777, 5389, 9299, 421, 16, 4141, 13, 6, 4, 20, 10, 25, 20, 21, 9, 13, 1, 7121