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: ['r', '9813', '7089', 'a', 't', 'Y', 'C', 'Y', '9267', 'k', 'R', 'Y', '7967', '5403', 'n', '5133', '8393', 'M', 'R', '189', 'v', '8285', 'l', '3019', '3155', 'n', 'b', 'v', 'u', 'l', '5495', 'u', '637', '4799', '1799', '2355', 'Z', 'V']

18, 9813, 7089, 1, 20, 25, 3, 25, 9267, 11, 18, 25, 7967, 5403, 14, 5133, 8393, 13, 18, 189, 22, 8285, 12, 3019, 3155, 14, 2, 22, 21, 12, 5495, 21, 637, 4799, 1799, 2355, 26, 22