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: ['739', '867', 'i', '5301', '1853', '8393', 'y', 'Z', '6055', 'b', '4507', 'p', '3203', '4337', '2499', 'l', 'n', 'E', 'z', '1437', '7627']

739, 867, 9, 5301, 1853, 8393, 25, 26, 6055, 2, 4507, 16, 3203, 4337, 2499, 12, 14, 5, 26, 1437, 7627