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: ['9711', '6561', 'h', '4465', '2401', 'j', '5639', '6533', '5463', 'v', 'L', '8069', '5295', '7241', '5815']

9711, 6561, 8, 4465, 2401, 10, 5639, 6533, 5463, 22, 12, 8069, 5295, 7241, 5815