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: ['4455', 'u', '4721', '9361', '603', '4861', 'E', 'k', '5257', '7573', 'I', '7201', 'l', '351', 'G', '1579', '7315', '3049', 'O', '9613', '389', 'S', 'z', 'q', 'K', 'W', 'I', 'z', '7821', 'j', '2735']

4455, 21, 4721, 9361, 603, 4861, 5, 11, 5257, 7573, 9, 7201, 12, 351, 7, 1579, 7315, 3049, 15, 9613, 389, 19, 26, 17, 11, 23, 9, 26, 7821, 10, 2735