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: ['5321', 'W', 'z', '5329', 'm', '4921', '5523', '2735', 'v', '8977', '523', 'N', 'j', 'S', '1037', '5719', 'L', 'P', '8115', '6205']

5321, 23, 26, 5329, 13, 4921, 5523, 2735, 22, 8977, 523, 14, 10, 19, 1037, 5719, 12, 16, 8115, 6205