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: ['a', '1291', 'P', 'o', 'u', 'e', 's', '203', 'P', '4031', '9627', 'q', 'H', '1305', '4839', '8293', 'd', '3719', '7615', 'k', '9147', 'H', '6011', 'F']

1, 1291, 16, 15, 21, 5, 19, 203, 16, 4031, 9627, 17, 8, 1305, 4839, 8293, 4, 3719, 7615, 11, 9147, 8, 6011, 6