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: ['N', '3251', '6923', '1621', 'Z', 'h', 'e', 'B', 's', '7639', 'b']

14, 3251, 6923, 1621, 26, 8, 5, 2, 19, 7639, 2