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', 'd', '1965', 'C', '4261', 'B', '7147', '299', 'V', '5783', '1923', 'V', 'Z', '6649', 'j']

14, 4, 1965, 3, 4261, 2, 7147, 299, 22, 5783, 1923, 22, 26, 6649, 10