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: ['l', 's', '739', '7647', 'v', '5675', '763', '2207', 'j', 'c', 'Q', 'A', 'a', 'B', 'P', '751', 'Z', 'H', '8431', 'N', '3339', '1275', 'D', 'B', 'o', 's', '7261']

12, 19, 739, 7647, 22, 5675, 763, 2207, 10, 3, 17, 1, 1, 2, 16, 751, 26, 8, 8431, 14, 3339, 1275, 4, 2, 15, 19, 7261