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: ['6255', 'Z', '6365', 'z', 'I', 'j', 'Y', 'v', '3439', '6749', '4441', 'F', 'u', 'y', '4627', '4381', '5705', 'B', '7927', 'N', '1871', '1895', '2997']

6255, 26, 6365, 26, 9, 10, 25, 22, 3439, 6749, 4441, 6, 21, 25, 4627, 4381, 5705, 2, 7927, 14, 1871, 1895, 2997