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: ['1299', '1969', '2423', '8425', '9959', '4615', 'm', 'C', '1253', '315', 'Y', 'x', 'W', '1751', '9533', '5437', '881', '6685', 'i', 'M', 'C', 'l', 'U', '7985', 'j', 'R', 'S', 'y', 'Z', 'a', 'p', 'q', 'h', '9323', '6711', 'G', '5713', '5857', '113']

1299, 1969, 2423, 8425, 9959, 4615, 13, 3, 1253, 315, 25, 24, 23, 1751, 9533, 5437, 881, 6685, 9, 13, 3, 12, 21, 7985, 10, 18, 19, 25, 26, 1, 16, 17, 8, 9323, 6711, 7, 5713, 5857, 113