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: ['l', '5955', 'X', '3579', '4529', 'J', 'f', '3319', '453', '1955', '7035', 'E', 'g', '5153', '7551']

12, 5955, 24, 3579, 4529, 10, 6, 3319, 453, 1955, 7035, 5, 7, 5153, 7551