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: ['2145', 'o', 'd', 'C', '5815', 'v', 'V', '7425', '9855', '4691', 'v', 'b', 'z', 'C', 'T', '6601', '7329', '1571', '1823', '5881', 'N', 'C']

2145, 15, 4, 3, 5815, 22, 22, 7425, 9855, 4691, 22, 2, 26, 3, 20, 6601, 7329, 1571, 1823, 5881, 14, 3