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: ['2371', 'u', 'm', '2511', 't', '3779', 'D', '9165', 'j', '9509', '6773', 'v']

2371, 21, 13, 2511, 20, 3779, 4, 9165, 10, 9509, 6773, 22