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: ['n', 'P', '2451', 'W', 'R', '7399', '6319', '8917', '5689', '791', 'a', '8307', 'M', 'i', 'd', 'k', '5619', '8441', 'u', '7471', '2735', 'd', '3445', 'r', '6011', 'z', '8743', '7227', 'c', '9165', 'Y', 'L', '3345', '8609', 'H', 'V']

14, 16, 2451, 23, 18, 7399, 6319, 8917, 5689, 791, 1, 8307, 13, 9, 4, 11, 5619, 8441, 21, 7471, 2735, 4, 3445, 18, 6011, 26, 8743, 7227, 3, 9165, 25, 12, 3345, 8609, 8, 22