Write a python code that create a string based on today's date. First part of the string is the date of the day in yyyymmdd format followed by a ‘_’; and second part is a number that NAME_1 according to the week, for the week begins at 2023-04-17, it is 1443, then the next week will be 1444, etc.; third part of the string is a single letter, which indicate the day in the week, for Monday it is A, Tuesday is B, and etc.. Please note that there will be no '_' between the second and third part of the string.