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: ['r', '1771', '2497', 'f', '3373', '6433', 'b', '7711', 'M', '1037', 'A', '6839', '39', '7851', 'J', '8695', '9853']

18, 1771, 2497, 6, 3373, 6433, 2, 7711, 13, 1037, 1, 6839, 39, 7851, 10, 8695, 9853