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: ['2599', '2869', 'v', 'F', '5193', '5453', 'U', '3937', '3953', 'l', '5731', '6997', '137', 'm', 'y', '2995', '5733', 'j', 'v', '8219', '675', 's', 'x', '5267', '515', 'm', 'o', '413', 'U', 'b', '4165']

2599, 2869, 22, 6, 5193, 5453, 21, 3937, 3953, 12, 5731, 6997, 137, 13, 25, 2995, 5733, 10, 22, 8219, 675, 19, 24, 5267, 515, 13, 15, 413, 21, 2, 4165