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: ['O', '4005', '3283', '8889', '1555', 'U', 'j', 'y', '5501', 'M', 't', 'V', 'c', '583', 's', 'G', '7395', '7887', 'v', '4839', '1213', '2889', '2961', '1959', 'c', '5571', '6465', '307', 'B', 'w', '7543', '5105', 'E', 'G', 'Z', '1133', '6097', '373', 'K', '2719']

15, 4005, 3283, 8889, 1555, 21, 10, 25, 5501, 13, 20, 22, 3, 583, 19, 7, 7395, 7887, 22, 4839, 1213, 2889, 2961, 1959, 3, 5571, 6465, 307, 2, 23, 7543, 5105, 5, 7, 26, 1133, 6097, 373, 11, 2719