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: ['3779', 'a', 'O', 'W', '3', 'o', '5747', '5955', 'h', 'S', '4857', '6049', 'I', 'e', 'm', 'c', 'X']

3779, 1, 15, 23, 3, 15, 5747, 5955, 8, 19, 4857, 6049, 9, 5, 13, 3, 24