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: ['3763', 'D', '5745', '7419', '6107', 'y', 'n', 'C', '4393', '2099', 'q', '3781', '5449']

3763, 4, 5745, 7419, 6107, 25, 14, 3, 4393, 2099, 17, 3781, 5449