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: ['T', '4655', '4981', 'l', '2215', 'u', 'p', 'T', '8703', '6959', '6039', '4093', 'Z', 'n']

20, 4655, 4981, 12, 2215, 21, 16, 20, 8703, 6959, 6039, 4093, 26, 14