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: ['6851', 'Q', 'X', '907', '3123', '177', 'L', '7977', '4953', '4931', 'R', '3327']

6851, 17, 24, 907, 3123, 177, 12, 7977, 4953, 4931, 18, 3327