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: ['F', 'r', 'D', '821', '2113', 'q', 'g', 'P', 'b', 'D', '3811', '1919', 'L', '7659', '5321', 'c', 'B', 'y', 'F', '6915', '6657', '4233', 'z', 'g', '6735', 'u', 'y']

6, 18, 4, 821, 2113, 17, 7, 16, 2, 4, 3811, 1919, 12, 7659, 5321, 3, 2, 25, 6, 6915, 6657, 4233, 26, 7, 6735, 21, 25