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: ['F', '4831', 'Z', '9181', 'k', 't', 'X', '689', '6593', '5749', 'i', 'u', 'S', 'e', '539', 'W', '3505', 'c', 'm', 'l', 'D', '1919', 'h', 'x', 'G', '4053', 'o', 'a', 'T', 'I', 'C']

6, 4831, 26, 9181, 11, 20, 24, 689, 6593, 5749, 9, 21, 19, 5, 539, 23, 3505, 3, 13, 12, 4, 1919, 8, 24, 7, 4053, 15, 1, 20, 9, 3