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: ['7627', 'z', 'X', '5577', '7447', 'C', 'i', '5603', '3269', '1169', 'K', '2999', 'U', 'a', 'G', '1091', 'C', 's', '5769', '9211', 's', '8623', '2669', '9615', 'm', 'g', 'Y', '839', 'm', 'H', '6313', '6865', 'u', 'r']

7627, 26, 24, 5577, 7447, 3, 9, 5603, 3269, 1169, 11, 2999, 21, 1, 7, 1091, 3, 19, 5769, 9211, 19, 8623, 2669, 9615, 13, 7, 25, 839, 13, 8, 6313, 6865, 21, 18