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: ['U', '4359', '5269', 'k', 'e', '8461', '9655', '7727', 'k', 'I', '5333', 'e', '6573', '4289', '9307', '1615', '1835', 'f', 'D', 'a', '6195', 's', '1751', 'J', 'H', '8253', '8987', 'W', '8541', '8945', '5309', '4529', 'r', '365', 's', 'f', '1919']

21, 4359, 5269, 11, 5, 8461, 9655, 7727, 11, 9, 5333, 5, 6573, 4289, 9307, 1615, 1835, 6, 4, 1, 6195, 19, 1751, 10, 8, 8253, 8987, 23, 8541, 8945, 5309, 4529, 18, 365, 19, 6, 1919