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: ['j', 'G', 'D', '6455', '1463', '9687', 'Q', '85', 'Y', 'l', 'R', '3457', '9573', '1611', '2763', '6157', '7727', 'Y', 'k']

10, 7, 4, 6455, 1463, 9687, 17, 85, 25, 12, 18, 3457, 9573, 1611, 2763, 6157, 7727, 25, 11