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', '7717', '2873', '8067', 'C', 'm', 't', 'p', '9545', '7139', 'N', 'a', 'h', '4259', 'Q', '87', 's', 'U', '9555', '9091', '8291', '1627', 'H', '4027']

15, 7717, 2873, 8067, 3, 13, 20, 16, 9545, 7139, 14, 1, 8, 4259, 17, 87, 19, 21, 9555, 9091, 8291, 1627, 8, 4027