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: ['3315', 'r', '6635', 'i', 'L', 'o', 'R', '7469', 'H', 'y', '7265']

3315, 18, 6635, 9, 12, 15, 18, 7469, 8, 25, 7265