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: ['1219', 'v', '4617', 'H', 'X', 'X', '4537', '5201', '391', '2773', 'h', '491', 'f', 'T', '5719', 'x', 'y', '5237', '17', 'U', '1629', 'm', 'i']

1219, 22, 4617, 8, 24, 24, 4537, 5201, 391, 2773, 8, 491, 6, 20, 5719, 24, 25, 5237, 17, 21, 1629, 13, 9