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: ['B', '1309', '1913', 'Q', '9839', '8695', '4321', 'U', 'S', 'b', '1213', '9195', 'I', '9983', '1119', '1811', 'I', 'l', 'K', '187', '5599', '4019', 'N', '6867', '9867', 'X', 'F', 'J']

2, 1309, 1913, 17, 9839, 8695, 4321, 21, 19, 2, 1213, 9195, 9, 9983, 1119, 1811, 9, 12, 11, 187, 5599, 4019, 14, 6867, 9867, 24, 6, 10