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: ['i', 'u', 'l', '3995', '1789', '5177', 'B', '5235', '2227', '7015', 'c', 'y', '1871', '9923', '7491', 'v', '5955', 'V', 'L', '543', 'j', '7157', 'B', 'p', '7513', '5017', 'n', '6599', '9519', 'Q', '5601', '7069', 'B', 'y', '5529', '6287', '6505', '5757', '7785', 'I']

9, 21, 12, 3995, 1789, 5177, 2, 5235, 2227, 7015, 3, 25, 1871, 9923, 7491, 22, 5955, 22, 12, 543, 10, 7157, 2, 16, 7513, 5017, 14, 6599, 9519, 17, 5601, 7069, 2, 25, 5529, 6287, 6505, 5757, 7785, 9