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: ['2845', 'O', 'R', '6109', '8091', '8701', 'j', 'B', '1585', '4853', '925', '7227', '4665', 't']

2845, 15, 18, 6109, 8091, 8701, 10, 2, 1585, 4853, 925, 7227, 4665, 20