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: ['7315', 'O', 'H', '2611', '6667', '9099', '9097', 'z', '8205', 'p', 'u', '8601', '9937', '1651', 'H', '5791', 'q', 'K', 'Q', '5571', '7303', 'q', '7873', '8293', 'x', '2261', '8267', 'K', 'f', 'y', 'U', '3721', '5723', 'V', 'O', '2715']

7315, 15, 8, 2611, 6667, 9099, 9097, 26, 8205, 16, 21, 8601, 9937, 1651, 8, 5791, 17, 11, 17, 5571, 7303, 17, 7873, 8293, 24, 2261, 8267, 11, 6, 25, 21, 3721, 5723, 22, 15, 2715