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: ['7205', '7279', 'F', 'd', 'R', 'P', 'x', '4083', 'O', '9973', 'W', 'H', 't', '3925', '585', '5621', 'V', 'F', '263', '4717', 'A']

7205, 7279, 6, 4, 18, 16, 24, 4083, 15, 9973, 23, 8, 20, 3925, 585, 5621, 22, 6, 263, 4717, 1