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', '9809', '4057', 'u', 'U', '3693', 'u', '4069', '6861', '6865', '9955', 'v', 'w', 'g', '9807', '1821', 'u', 'z', 'I', 'h', '6087', '9667', 'j', 'Z', '5797', '647', '6927', '7435', '789', 'i', '6257', 'K']

2, 9809, 4057, 21, 21, 3693, 21, 4069, 6861, 6865, 9955, 22, 23, 7, 9807, 1821, 21, 26, 9, 8, 6087, 9667, 10, 26, 5797, 647, 6927, 7435, 789, 9, 6257, 11