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: ['D', '731', 'o', 'P', '2979', 's', '5573', 'p', 'i', 'G', 'R', '5507', '3513', 'g', 'V', 'i', '9843', 'I', 'N', '4201', 'F', '4287', '825', 'M', '3607', 'x', 'E', 'f', '3773', 'l', 'm', 'e', 'o', 'O', 'w', '3339']

4, 731, 15, 16, 2979, 19, 5573, 16, 9, 7, 18, 5507, 3513, 7, 22, 9, 9843, 9, 14, 4201, 6, 4287, 825, 13, 3607, 24, 5, 6, 3773, 12, 13, 5, 15, 15, 23, 3339