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: ['8351', 'T', '1267', 'L', '7099', '417', '4395', 'K', '9041', '1153', '6823', 'z', 'G', 'g', 'j', '8651', 'W', '4793', 'v', '5383']

8351, 20, 1267, 12, 7099, 417, 4395, 11, 9041, 1153, 6823, 26, 7, 7, 10, 8651, 23, 4793, 22, 5383