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: ['6223', 'A', '215', 'u', '3087', '9131', 'h', '85', '9235', 'j', 'z', '5767', '4421', 'o', '6071', '4259', '7065', 'm', '4313', 'J']

6223, 1, 215, 21, 3087, 9131, 8, 85, 9235, 10, 26, 5767, 4421, 15, 6071, 4259, 7065, 13, 4313, 10