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: ['s', '3637', 'W', '9687', '2697', 'W', '4067', 'i', 'Z', '8393', 'T', '4855', 'Z', 'p', '8107', 'W', '4105', 'T']

19, 3637, 23, 9687, 2697, 23, 4067, 9, 26, 8393, 20, 4855, 26, 16, 8107, 23, 4105, 20